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name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> <input id="query" name="query" type="text" value="Li, W"> <ul id="abstracts"><li><input checked id="abstracts-0" name="abstracts" type="radio" value="show"> <label for="abstracts-0">Show abstracts</label></li><li><input id="abstracts-1" name="abstracts" 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is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Li%2C+W&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=150" class="pagination-link " aria-label="Page 4" aria-current="page">4 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=200" class="pagination-link " aria-label="Page 5" aria-current="page">5 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=250" class="pagination-link " aria-label="Page 6" aria-current="page">6 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.09470">arXiv:2411.09470</a> <span> [<a href="https://arxiv.org/pdf/2411.09470">pdf</a>, <a href="https://arxiv.org/format/2411.09470">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum synchronization in an all-optical stroboscopic quantum simulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+Y">Yan Li</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+X">Xingli Li</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenlin Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.09470v1-abstract-short" style="display: inline;"> In this work, we propose an all-optical stroboscopic scheme to simulate an open quantum system. By incorporating the tritter, consisting of a group of beam splitters, we find the emergence of spontaneous anti-phase synchronization in the steady state. To better understand the synchronization and entanglement properties within the system, we utilize the relative error measure and find the distribut… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09470v1-abstract-full').style.display = 'inline'; document.getElementById('2411.09470v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.09470v1-abstract-full" style="display: none;"> In this work, we propose an all-optical stroboscopic scheme to simulate an open quantum system. By incorporating the tritter, consisting of a group of beam splitters, we find the emergence of spontaneous anti-phase synchronization in the steady state. To better understand the synchronization and entanglement properties within the system, we utilize the relative error measure and find the distribution of logarithmic negativity in parameter space shows similar structures with the results of synchronization measure. Finally, we derive the adjoint master equation corresponding to the system when the synchronization condition is satisfied and explain the existence of oscillations. In addition, we explore the effect of non-Markovianity on synchronization, and we find that it only slows down the time for the system to reach the steady state but does not change the synchronization properties of the steady state. Our work provides a promising scheme for experimental studies focused on synchronization and other nonequilibrium steady states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09470v1-abstract-full').style.display = 'none'; document.getElementById('2411.09470v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 7 figures, accepted version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.03953">arXiv:2411.03953</a> <span> [<a href="https://arxiv.org/pdf/2411.03953">pdf</a>, <a href="https://arxiv.org/format/2411.03953">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Emergent dynamical quantum phase transition in a $Z_3$ symmetric chiral clock model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Yu%2C+L">Ling-Feng Yu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei-Lin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Yu%2C+X">Xue-Jia Yu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Z">Zhi Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.03953v1-abstract-short" style="display: inline;"> We study the quench dynamics in a $Z_3$ symmetric chiral clock model (CCM). The results reveal that chiral phases can lead to the emergence of dynamical quantum phase transition (DQPT). By analyzing Lee-Yang-Fisher zeros' distribution in the complex plane, we uncover the relation between the chiral phase and the emergence of DQPT. In concrete terms, only by taking some special angles can DQPT be i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.03953v1-abstract-full').style.display = 'inline'; document.getElementById('2411.03953v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.03953v1-abstract-full" style="display: none;"> We study the quench dynamics in a $Z_3$ symmetric chiral clock model (CCM). The results reveal that chiral phases can lead to the emergence of dynamical quantum phase transition (DQPT). By analyzing Lee-Yang-Fisher zeros' distribution in the complex plane, we uncover the relation between the chiral phase and the emergence of DQPT. In concrete terms, only by taking some special angles can DQPT be induced. We confirm the above relation by computing the non-analytic points in Loschmidt echo return rate function. Furthermore, through the analysis of the corresponding dynamical partition function, we reveal the mechanism of the emergent DQPT and deduce the analytical expression of dynamical partition function's zero points' coordinates. Based on the analytic expression, one can obtain all the angles that induce DQPT's emergence and predict more possible DQPT in the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.03953v1-abstract-full').style.display = 'none'; document.getElementById('2411.03953v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.23633">arXiv:2410.23633</a> <span> [<a href="https://arxiv.org/pdf/2410.23633">pdf</a>, <a href="https://arxiv.org/format/2410.23633">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> </div> <p class="title is-5 mathjax"> Restoring Kibble-Zurek Scaling and Defect Freezing in Non-Hermitian Systems under Biorthogonal Framework </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Deng%2C+M">Menghua Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Hu%2C+K">Kangyi Hu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+F">Fuxiang Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.23633v1-abstract-short" style="display: inline;"> Non-Hermitian physics provides an effective description of open and nonequilibrium systems and hosts many novel and intriguing phenomena such as exceptional points and non-Hermitian skin effect. Despite extensive theoretical and experimental studies, however, how to properly deal with the nonadiabatic dynamics in driven non-Hermitian quantum system is still under debate. Here, we develop a theoret… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.23633v1-abstract-full').style.display = 'inline'; document.getElementById('2410.23633v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.23633v1-abstract-full" style="display: none;"> Non-Hermitian physics provides an effective description of open and nonequilibrium systems and hosts many novel and intriguing phenomena such as exceptional points and non-Hermitian skin effect. Despite extensive theoretical and experimental studies, however, how to properly deal with the nonadiabatic dynamics in driven non-Hermitian quantum system is still under debate. Here, we develop a theoretical framework based on time-dependent biorthogonal quantum formalism by redefining the associated state to obtain the gauge-independent transition probability, and study the nonadiabatic dynamics of a linearly driven non-Hermitian system. In contrast to the normalization method that leads to a modified Kibble-Zurek scaling behavior, our approach predicts that the defect production at exceptional points exhibits power-law scaling behaviors conforming to the Kibble-Zurek mechanism. In the fast quench regime, universal scaling behaviors are also found with respect to the initial quenching parameter, which can be explained by the impulse-adiabatic approximation. Moreover, as trespassing the PT -broken region, the phenomenon of defect freezing, i.e., violation of adiabaticity, is observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.23633v1-abstract-full').style.display = 'none'; document.getElementById('2410.23633v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.15121">arXiv:2410.15121</a> <span> [<a href="https://arxiv.org/pdf/2410.15121">pdf</a>, <a href="https://arxiv.org/format/2410.15121">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Simulating and investigating various dynamic aspects of $\rm{H}_2\rm{O}$-related hydrogen bond model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=You%2C+J">Jiangchuan You</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+R">Ran Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wanshun Li</a>, <a href="/search/quant-ph?searchtype=author&query=Miao%2C+H">Hui-hui Miao</a>, <a href="/search/quant-ph?searchtype=author&query=Ozhigov%2C+Y+I">Yuri Igorevich Ozhigov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.15121v2-abstract-short" style="display: inline;"> A simple $\rm{H}_2\rm{O}$-related hydrogen bond model, modified from the Jaynes-Cummings model, is proposed and its various dynamic aspects are investigated theoretically. In this model, the formation and breaking processes of hydrogen bond are accompanied by the creation and annihilation of the thermal phonon of the medium. A number of simplifying assumptions about the dynamics of the molecules i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15121v2-abstract-full').style.display = 'inline'; document.getElementById('2410.15121v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.15121v2-abstract-full" style="display: none;"> A simple $\rm{H}_2\rm{O}$-related hydrogen bond model, modified from the Jaynes-Cummings model, is proposed and its various dynamic aspects are investigated theoretically. In this model, the formation and breaking processes of hydrogen bond are accompanied by the creation and annihilation of the thermal phonon of the medium. A number of simplifying assumptions about the dynamics of the molecules involved are used. Rotating wave approximation is applied under consideration of the strong-coupling condition. Dissipative dynamics under the Markovian approximation is obtained through solving the quantum master equation - Lindbladian. The probabilities of reaction channels involving hydrogen bond depending on the parameters of the external environment, are obtained. Differences between unitary and dissipative evolutions are discussed. Consideration is given to the effect of all kinds of potential interactions and dissipations on evolution. Consideration is also given to the reverse processes (inflows) of dissipations. The results show that the magnitude changes of the interactions and dissipations have a slight effect on the formation of hydrogen bond, but the variation of the inflows significantly affects the formation of hydrogen bond. According to the findings, the dynamics of $\rm{H}_2\rm{O}$-related hydrogen bond model can be controlled by selectively choosing system parameters. The results will be used as a basis to extend the research to more complex chemical and biological models in the future. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15121v2-abstract-full').style.display = 'none'; document.getElementById('2410.15121v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 11 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.06557">arXiv:2410.06557</a> <span> [<a href="https://arxiv.org/pdf/2410.06557">pdf</a>, <a href="https://arxiv.org/format/2410.06557">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Observation of disorder-free localization and efficient disorder averaging on a quantum processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Gyawali%2C+G">Gaurav Gyawali</a>, <a href="/search/quant-ph?searchtype=author&query=Cochran%2C+T">Tyler Cochran</a>, <a href="/search/quant-ph?searchtype=author&query=Lensky%2C+Y">Yuri Lensky</a>, <a href="/search/quant-ph?searchtype=author&query=Rosenberg%2C+E">Eliott Rosenberg</a>, <a href="/search/quant-ph?searchtype=author&query=Karamlou%2C+A+H">Amir H. Karamlou</a>, <a href="/search/quant-ph?searchtype=author&query=Kechedzhi%2C+K">Kostyantyn Kechedzhi</a>, <a href="/search/quant-ph?searchtype=author&query=Berndtsson%2C+J">Julia Berndtsson</a>, <a href="/search/quant-ph?searchtype=author&query=Westerhout%2C+T">Tom Westerhout</a>, <a href="/search/quant-ph?searchtype=author&query=Asfaw%2C+A">Abraham Asfaw</a>, <a href="/search/quant-ph?searchtype=author&query=Abanin%2C+D">Dmitry Abanin</a>, <a href="/search/quant-ph?searchtype=author&query=Acharya%2C+R">Rajeev Acharya</a>, <a href="/search/quant-ph?searchtype=author&query=Beni%2C+L+A">Laleh Aghababaie Beni</a>, <a href="/search/quant-ph?searchtype=author&query=Andersen%2C+T+I">Trond I. Andersen</a>, <a href="/search/quant-ph?searchtype=author&query=Ansmann%2C+M">Markus Ansmann</a>, <a href="/search/quant-ph?searchtype=author&query=Arute%2C+F">Frank Arute</a>, <a href="/search/quant-ph?searchtype=author&query=Arya%2C+K">Kunal Arya</a>, <a href="/search/quant-ph?searchtype=author&query=Astrakhantsev%2C+N">Nikita Astrakhantsev</a>, <a href="/search/quant-ph?searchtype=author&query=Atalaya%2C+J">Juan Atalaya</a>, <a href="/search/quant-ph?searchtype=author&query=Babbush%2C+R">Ryan Babbush</a>, <a href="/search/quant-ph?searchtype=author&query=Ballard%2C+B">Brian Ballard</a>, <a href="/search/quant-ph?searchtype=author&query=Bardin%2C+J+C">Joseph C. Bardin</a>, <a href="/search/quant-ph?searchtype=author&query=Bengtsson%2C+A">Andreas Bengtsson</a>, <a href="/search/quant-ph?searchtype=author&query=Bilmes%2C+A">Alexander Bilmes</a>, <a href="/search/quant-ph?searchtype=author&query=Bortoli%2C+G">Gina Bortoli</a>, <a href="/search/quant-ph?searchtype=author&query=Bourassa%2C+A">Alexandre Bourassa</a> , et al. (195 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.06557v1-abstract-short" style="display: inline;"> One of the most challenging problems in the computational study of localization in quantum manybody systems is to capture the effects of rare events, which requires sampling over exponentially many disorder realizations. We implement an efficient procedure on a quantum processor, leveraging quantum parallelism, to efficiently sample over all disorder realizations. We observe localization without d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.06557v1-abstract-full').style.display = 'inline'; document.getElementById('2410.06557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.06557v1-abstract-full" style="display: none;"> One of the most challenging problems in the computational study of localization in quantum manybody systems is to capture the effects of rare events, which requires sampling over exponentially many disorder realizations. We implement an efficient procedure on a quantum processor, leveraging quantum parallelism, to efficiently sample over all disorder realizations. We observe localization without disorder in quantum many-body dynamics in one and two dimensions: perturbations do not diffuse even though both the generator of evolution and the initial states are fully translationally invariant. The disorder strength as well as its density can be readily tuned using the initial state. Furthermore, we demonstrate the versatility of our platform by measuring Renyi entropies. Our method could also be extended to higher moments of the physical observables and disorder learning. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.06557v1-abstract-full').style.display = 'none'; document.getElementById('2410.06557v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.19359">arXiv:2409.19359</a> <span> [<a href="https://arxiv.org/pdf/2409.19359">pdf</a>, <a href="https://arxiv.org/format/2409.19359">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> </div> </div> <p class="title is-5 mathjax"> Quantum delegated and federated learning via quantum homomorphic encryption </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+D">Dong-Ling Deng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.19359v1-abstract-short" style="display: inline;"> Quantum learning models hold the potential to bring computational advantages over the classical realm. As powerful quantum servers become available on the cloud, ensuring the protection of clients' private data becomes crucial. By incorporating quantum homomorphic encryption schemes, we present a general framework that enables quantum delegated and federated learning with a computation-theoretical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19359v1-abstract-full').style.display = 'inline'; document.getElementById('2409.19359v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.19359v1-abstract-full" style="display: none;"> Quantum learning models hold the potential to bring computational advantages over the classical realm. As powerful quantum servers become available on the cloud, ensuring the protection of clients' private data becomes crucial. By incorporating quantum homomorphic encryption schemes, we present a general framework that enables quantum delegated and federated learning with a computation-theoretical data privacy guarantee. We show that learning and inference under this framework feature substantially lower communication complexity compared with schemes based on blind quantum computing. In addition, in the proposed quantum federated learning scenario, there is less computational burden on local quantum devices from the client side, since the server can operate on encrypted quantum data without extracting any information. We further prove that certain quantum speedups in supervised learning carry over to private delegated learning scenarios employing quantum kernel methods. Our results provide a valuable guide toward privacy-guaranteed quantum learning on the cloud, which may benefit future studies and security-related applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19359v1-abstract-full').style.display = 'none'; document.getElementById('2409.19359v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 1 figure, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.17142">arXiv:2409.17142</a> <span> [<a href="https://arxiv.org/pdf/2409.17142">pdf</a>, <a href="https://arxiv.org/format/2409.17142">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> </div> </div> <p class="title is-5 mathjax"> Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Cochran%2C+T+A">Tyler A. Cochran</a>, <a href="/search/quant-ph?searchtype=author&query=Jobst%2C+B">Bernhard Jobst</a>, <a href="/search/quant-ph?searchtype=author&query=Rosenberg%2C+E">Eliott Rosenberg</a>, <a href="/search/quant-ph?searchtype=author&query=Lensky%2C+Y+D">Yuri D. Lensky</a>, <a href="/search/quant-ph?searchtype=author&query=Gyawali%2C+G">Gaurav Gyawali</a>, <a href="/search/quant-ph?searchtype=author&query=Eassa%2C+N">Norhan Eassa</a>, <a href="/search/quant-ph?searchtype=author&query=Will%2C+M">Melissa Will</a>, <a href="/search/quant-ph?searchtype=author&query=Abanin%2C+D">Dmitry Abanin</a>, <a href="/search/quant-ph?searchtype=author&query=Acharya%2C+R">Rajeev Acharya</a>, <a href="/search/quant-ph?searchtype=author&query=Beni%2C+L+A">Laleh Aghababaie Beni</a>, <a href="/search/quant-ph?searchtype=author&query=Andersen%2C+T+I">Trond I. Andersen</a>, <a href="/search/quant-ph?searchtype=author&query=Ansmann%2C+M">Markus Ansmann</a>, <a href="/search/quant-ph?searchtype=author&query=Arute%2C+F">Frank Arute</a>, <a href="/search/quant-ph?searchtype=author&query=Arya%2C+K">Kunal Arya</a>, <a href="/search/quant-ph?searchtype=author&query=Asfaw%2C+A">Abraham Asfaw</a>, <a href="/search/quant-ph?searchtype=author&query=Atalaya%2C+J">Juan Atalaya</a>, <a href="/search/quant-ph?searchtype=author&query=Babbush%2C+R">Ryan Babbush</a>, <a href="/search/quant-ph?searchtype=author&query=Ballard%2C+B">Brian Ballard</a>, <a href="/search/quant-ph?searchtype=author&query=Bardin%2C+J+C">Joseph C. Bardin</a>, <a href="/search/quant-ph?searchtype=author&query=Bengtsson%2C+A">Andreas Bengtsson</a>, <a href="/search/quant-ph?searchtype=author&query=Bilmes%2C+A">Alexander Bilmes</a>, <a href="/search/quant-ph?searchtype=author&query=Bourassa%2C+A">Alexandre Bourassa</a>, <a href="/search/quant-ph?searchtype=author&query=Bovaird%2C+J">Jenna Bovaird</a>, <a href="/search/quant-ph?searchtype=author&query=Broughton%2C+M">Michael Broughton</a>, <a href="/search/quant-ph?searchtype=author&query=Browne%2C+D+A">David A. Browne</a> , et al. (167 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.17142v1-abstract-short" style="display: inline;"> Lattice gauge theories (LGTs) can be employed to understand a wide range of phenomena, from elementary particle scattering in high-energy physics to effective descriptions of many-body interactions in materials. Studying dynamical properties of emergent phases can be challenging as it requires solving many-body problems that are generally beyond perturbative limits. We investigate the dynamics of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.17142v1-abstract-full').style.display = 'inline'; document.getElementById('2409.17142v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.17142v1-abstract-full" style="display: none;"> Lattice gauge theories (LGTs) can be employed to understand a wide range of phenomena, from elementary particle scattering in high-energy physics to effective descriptions of many-body interactions in materials. Studying dynamical properties of emergent phases can be challenging as it requires solving many-body problems that are generally beyond perturbative limits. We investigate the dynamics of local excitations in a $\mathbb{Z}_2$ LGT using a two-dimensional lattice of superconducting qubits. We first construct a simple variational circuit which prepares low-energy states that have a large overlap with the ground state; then we create particles with local gates and simulate their quantum dynamics via a discretized time evolution. As the effective magnetic field is increased, our measurements show signatures of transitioning from deconfined to confined dynamics. For confined excitations, the magnetic field induces a tension in the string connecting them. Our method allows us to experimentally image string dynamics in a (2+1)D LGT from which we uncover two distinct regimes inside the confining phase: for weak confinement the string fluctuates strongly in the transverse direction, while for strong confinement transverse fluctuations are effectively frozen. In addition, we demonstrate a resonance condition at which dynamical string breaking is facilitated. Our LGT implementation on a quantum processor presents a novel set of techniques for investigating emergent particle and string dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.17142v1-abstract-full').style.display = 'none'; document.getElementById('2409.17142v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.15665">arXiv:2409.15665</a> <span> [<a href="https://arxiv.org/pdf/2409.15665">pdf</a>, <a href="https://arxiv.org/format/2409.15665">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Dynamically Optimized Nonadiabatic Holonomic Quantum Computation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Xu%2C+H">Hai Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wanchun Li</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+T">Tao Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wei%2C+K">Kejin Wei</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chengxian Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.15665v1-abstract-short" style="display: inline;"> Nonadiabatic holonomic quantum computation (NHQC) is one of the promising approaches to realizing fault-tolerant quantum computation. However, due to the imperfect control in the experimental environments, the holonomic gate still needs to be further improved. Here, we propose a dynamically optimized NHQC (OPNHQC) scheme based on dynamically corrected gate technique. The scheme is implemented by c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15665v1-abstract-full').style.display = 'inline'; document.getElementById('2409.15665v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.15665v1-abstract-full" style="display: none;"> Nonadiabatic holonomic quantum computation (NHQC) is one of the promising approaches to realizing fault-tolerant quantum computation. However, due to the imperfect control in the experimental environments, the holonomic gate still needs to be further improved. Here, we propose a dynamically optimized NHQC (OPNHQC) scheme based on dynamically corrected gate technique. The scheme is implemented by carefully designing a sequence of elementary pulses to fulfill cyclic evolution, while the dynamical phase is not accumulated. In this way, the constructed holonomic gate is immune to the error. It is found that our scheme can correct the $X$ error up to fourth order. In addition, combining with the DFS encoding our scheme can be immune to both the $X$ and $Z$ errors. Therefore, our proposed scheme offers a prospective way to the realization of scalable fault-tolerant holonomic quantum computation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15665v1-abstract-full').style.display = 'none'; document.getElementById('2409.15665v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.09729">arXiv:2409.09729</a> <span> [<a href="https://arxiv.org/pdf/2409.09729">pdf</a>, <a href="https://arxiv.org/format/2409.09729">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum continual learning on a programmable superconducting processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Lu%2C+Z">Zhide Lu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+L">Liangtian Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/quant-ph?searchtype=author&query=Cui%2C+Z">Zhengyi Cui</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+T">Tingting Li</a>, <a href="/search/quant-ph?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Song%2C+Z">Zixuan Song</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+J">Jinfeng Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Dong%2C+H">Hang Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Pengfei Zhang</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.09729v1-abstract-short" style="display: inline;"> Quantum computers may outperform classical computers on machine learning tasks. In recent years, a variety of quantum algorithms promising unparalleled potential to enhance, speed up, or innovate machine learning have been proposed. Yet, quantum learning systems, similar to their classical counterparts, may likewise suffer from the catastrophic forgetting problem, where training a model with new t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.09729v1-abstract-full').style.display = 'inline'; document.getElementById('2409.09729v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.09729v1-abstract-full" style="display: none;"> Quantum computers may outperform classical computers on machine learning tasks. In recent years, a variety of quantum algorithms promising unparalleled potential to enhance, speed up, or innovate machine learning have been proposed. Yet, quantum learning systems, similar to their classical counterparts, may likewise suffer from the catastrophic forgetting problem, where training a model with new tasks would result in a dramatic performance drop for the previously learned ones. This problem is widely believed to be a crucial obstacle to achieving continual learning of multiple sequential tasks. Here, we report an experimental demonstration of quantum continual learning on a fully programmable superconducting processor. In particular, we sequentially train a quantum classifier with three tasks, two about identifying real-life images and the other on classifying quantum states, and demonstrate its catastrophic forgetting through experimentally observed rapid performance drops for prior tasks. To overcome this dilemma, we exploit the elastic weight consolidation strategy and show that the quantum classifier can incrementally learn and retain knowledge across the three distinct tasks, with an average prediction accuracy exceeding 92.3%. In addition, for sequential tasks involving quantum-engineered data, we demonstrate that the quantum classifier can achieve a better continual learning performance than a commonly used classical feedforward network with a comparable number of variational parameters. Our results establish a viable strategy for empowering quantum learning systems with desirable adaptability to multiple sequential tasks, marking an important primary experimental step towards the long-term goal of achieving quantum artificial general intelligence. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.09729v1-abstract-full').style.display = 'none'; document.getElementById('2409.09729v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 14 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.13687">arXiv:2408.13687</a> <span> [<a href="https://arxiv.org/pdf/2408.13687">pdf</a>, <a href="https://arxiv.org/format/2408.13687">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum error correction below the surface code threshold </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Acharya%2C+R">Rajeev Acharya</a>, <a href="/search/quant-ph?searchtype=author&query=Aghababaie-Beni%2C+L">Laleh Aghababaie-Beni</a>, <a href="/search/quant-ph?searchtype=author&query=Aleiner%2C+I">Igor Aleiner</a>, <a href="/search/quant-ph?searchtype=author&query=Andersen%2C+T+I">Trond I. Andersen</a>, <a href="/search/quant-ph?searchtype=author&query=Ansmann%2C+M">Markus Ansmann</a>, <a href="/search/quant-ph?searchtype=author&query=Arute%2C+F">Frank Arute</a>, <a href="/search/quant-ph?searchtype=author&query=Arya%2C+K">Kunal Arya</a>, <a href="/search/quant-ph?searchtype=author&query=Asfaw%2C+A">Abraham Asfaw</a>, <a href="/search/quant-ph?searchtype=author&query=Astrakhantsev%2C+N">Nikita Astrakhantsev</a>, <a href="/search/quant-ph?searchtype=author&query=Atalaya%2C+J">Juan Atalaya</a>, <a href="/search/quant-ph?searchtype=author&query=Babbush%2C+R">Ryan Babbush</a>, <a href="/search/quant-ph?searchtype=author&query=Bacon%2C+D">Dave Bacon</a>, <a href="/search/quant-ph?searchtype=author&query=Ballard%2C+B">Brian Ballard</a>, <a href="/search/quant-ph?searchtype=author&query=Bardin%2C+J+C">Joseph C. Bardin</a>, <a href="/search/quant-ph?searchtype=author&query=Bausch%2C+J">Johannes Bausch</a>, <a href="/search/quant-ph?searchtype=author&query=Bengtsson%2C+A">Andreas Bengtsson</a>, <a href="/search/quant-ph?searchtype=author&query=Bilmes%2C+A">Alexander Bilmes</a>, <a href="/search/quant-ph?searchtype=author&query=Blackwell%2C+S">Sam Blackwell</a>, <a href="/search/quant-ph?searchtype=author&query=Boixo%2C+S">Sergio Boixo</a>, <a href="/search/quant-ph?searchtype=author&query=Bortoli%2C+G">Gina Bortoli</a>, <a href="/search/quant-ph?searchtype=author&query=Bourassa%2C+A">Alexandre Bourassa</a>, <a href="/search/quant-ph?searchtype=author&query=Bovaird%2C+J">Jenna Bovaird</a>, <a href="/search/quant-ph?searchtype=author&query=Brill%2C+L">Leon Brill</a>, <a href="/search/quant-ph?searchtype=author&query=Broughton%2C+M">Michael Broughton</a>, <a href="/search/quant-ph?searchtype=author&query=Browne%2C+D+A">David A. Browne</a> , et al. (224 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.13687v1-abstract-short" style="display: inline;"> Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit, where the logical error rate is suppressed exponentially as more qubits are added. However, this exponential suppression only occurs if the physical error rate is below a critical threshold. In this work, we present two surface code memories operating below this… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.13687v1-abstract-full').style.display = 'inline'; document.getElementById('2408.13687v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.13687v1-abstract-full" style="display: none;"> Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit, where the logical error rate is suppressed exponentially as more qubits are added. However, this exponential suppression only occurs if the physical error rate is below a critical threshold. In this work, we present two surface code memories operating below this threshold: a distance-7 code and a distance-5 code integrated with a real-time decoder. The logical error rate of our larger quantum memory is suppressed by a factor of $螞$ = 2.14 $\pm$ 0.02 when increasing the code distance by two, culminating in a 101-qubit distance-7 code with 0.143% $\pm$ 0.003% error per cycle of error correction. This logical memory is also beyond break-even, exceeding its best physical qubit's lifetime by a factor of 2.4 $\pm$ 0.3. We maintain below-threshold performance when decoding in real time, achieving an average decoder latency of 63 $渭$s at distance-5 up to a million cycles, with a cycle time of 1.1 $渭$s. To probe the limits of our error-correction performance, we run repetition codes up to distance-29 and find that logical performance is limited by rare correlated error events occurring approximately once every hour, or 3 $\times$ 10$^9$ cycles. Our results present device performance that, if scaled, could realize the operational requirements of large scale fault-tolerant quantum algorithms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.13687v1-abstract-full').style.display = 'none'; document.getElementById('2408.13687v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, Supplementary Information</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.12268">arXiv:2408.12268</a> <span> [<a href="https://arxiv.org/pdf/2408.12268">pdf</a>, <a href="https://arxiv.org/format/2408.12268">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1364/OE.539719">10.1364/OE.539719 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of electric field induced superradiance slowdown in ultracold Rydberg atomic gases </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=He%2C+Y">Yunhui He</a>, <a href="/search/quant-ph?searchtype=author&query=Bai%2C+J">Jingxu Bai</a>, <a href="/search/quant-ph?searchtype=author&query=Jiao%2C+Y">Yuechun Jiao</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=zhao%2C+J">Jianming zhao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.12268v2-abstract-short" style="display: inline;"> Atoms excited to electronically high-lying Rydberg states decay to low-energy states through spontaneous emission processes. We investigate the impact of a static electric field on the superradiant emission process between Rydberg $|60D_{5/2}\rangle$ and $|61P_{3/2}\rangle$ states in an ultracold Cesium Rydberg atom ensemble. We report experimental observations of a significant slowdown in superra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.12268v2-abstract-full').style.display = 'inline'; document.getElementById('2408.12268v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.12268v2-abstract-full" style="display: none;"> Atoms excited to electronically high-lying Rydberg states decay to low-energy states through spontaneous emission processes. We investigate the impact of a static electric field on the superradiant emission process between Rydberg $|60D_{5/2}\rangle$ and $|61P_{3/2}\rangle$ states in an ultracold Cesium Rydberg atom ensemble. We report experimental observations of a significant slowdown in superradiance upon applying an electric field. To understand the slowing down dynamics, we employ a discrete truncated Wigner approximation (DTWA) method to solve the corresponding master equation numerically. Our numerical simulations demonstrate that superradiance decoherence is caused by the Stark shifts of the Rydberg level. Our theoretical simulations qualitatively match the experimental observations. Our work provides new insights into controlling quantum critical behaviors, with implications for quantum many-body dynamics, and the study of quantum phase transitions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.12268v2-abstract-full').style.display = 'none'; document.getElementById('2408.12268v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Opt. Express 32, 43543-43552 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.07960">arXiv:2408.07960</a> <span> [<a href="https://arxiv.org/pdf/2408.07960">pdf</a>, <a href="https://arxiv.org/format/2408.07960">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Characterization of Intensity Correlation via Single-photon Detection in Quantum Key Distribution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Xing%2C+T">Tianyi Xing</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+J">Junxuan Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+L">Likang Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+M">Min-Yan Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Y">Yu-Huai Li</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+R">Ruiyin Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Peng%2C+Q">Qingquan Peng</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+D">Dongyang Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+Y">Yaxuan Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+H">Hongwei Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Cao%2C+Y">Yuan Cao</a>, <a href="/search/quant-ph?searchtype=author&query=Huang%2C+A">Anqi Huang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.07960v2-abstract-short" style="display: inline;"> One of the most significant vulnerabilities in the source unit of quantum key distribution (QKD) is the correlation between quantum states after modulation, which shall be characterized and evaluated for its practical security performance. In this work, we propose a methodology to characterize the intensity correlation according to the single-photon detection results in the measurement unit withou… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.07960v2-abstract-full').style.display = 'inline'; document.getElementById('2408.07960v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.07960v2-abstract-full" style="display: none;"> One of the most significant vulnerabilities in the source unit of quantum key distribution (QKD) is the correlation between quantum states after modulation, which shall be characterized and evaluated for its practical security performance. In this work, we propose a methodology to characterize the intensity correlation according to the single-photon detection results in the measurement unit without modifying the configuration of the QKD system. In contrast to the previous research that employs extra classical optical detector to measure the correlation, our method can directly analyse the detection data generated during the raw key exchange, enabling to characterize the feature of correlation in real-time system operation. The basic method is applied to a BB84 QKD system and the characterized correlation decreases the secure key rate shown by the security proof. Furthermore, the method is extended and applied to characterize the correlation from the result of Bell-state measurement, which demonstrates its applicability to a running full-scheme MDI QKD system. This study provides an approach for standard certification of a QKD system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.07960v2-abstract-full').style.display = 'none'; document.getElementById('2408.07960v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.07552">arXiv:2408.07552</a> <span> [<a href="https://arxiv.org/pdf/2408.07552">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum key distribution based on mid-infrared and telecom band two-color entanglement source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wu-Zhen Li</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+C">Chun Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+Y">Yang Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+L">Li Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+R">Ren-Hui Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Han%2C+Z">Zhao-Qi-Zhi Han</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+M">Ming-Yuan Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+X">Xiao-Hua Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zheng%2C+D">Di-Yuan Zheng</a>, <a href="/search/quant-ph?searchtype=author&query=Xie%2C+M">Meng-Yu Xie</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Y">Yin-Hai Li</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+Z">Zhi-Yuan Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+W">Wan-Su Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Shi%2C+B">Bao-Sen Shi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.07552v1-abstract-short" style="display: inline;"> Due to the high noise caused by solar background radiation, the existing satellite-based free-space quantum key distribution (QKD) experiments are mainly carried out at night, hindering the establishment of a practical all-day real-time global-scale quantum network. Given that the 3-5 渭m mid-infrared (MIR) band has extremely low solar background radiation and strong scattering resistance, it is on… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.07552v1-abstract-full').style.display = 'inline'; document.getElementById('2408.07552v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.07552v1-abstract-full" style="display: none;"> Due to the high noise caused by solar background radiation, the existing satellite-based free-space quantum key distribution (QKD) experiments are mainly carried out at night, hindering the establishment of a practical all-day real-time global-scale quantum network. Given that the 3-5 渭m mid-infrared (MIR) band has extremely low solar background radiation and strong scattering resistance, it is one of the ideal bands for free-space quantum communication. Here, firstly, we report on the preparation of a high-quality MIR (3370 nm) and telecom band (1555 nm) two-color polarization-entangled photon source, then we use this source to realize a principle QKD based on free-space and fiber hybrid channels in a laboratory. The theoretical analysis clearly shows that a long-distance QKD over 500 km of free-space and 96 km of fiber hybrid channels can be reached simultaneously. This work represents a significant step toward developing all-day global-scale quantum communication networks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.07552v1-abstract-full').style.display = 'none'; document.getElementById('2408.07552v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.20107">arXiv:2407.20107</a> <span> [<a href="https://arxiv.org/pdf/2407.20107">pdf</a>, <a href="https://arxiv.org/format/2407.20107">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Commensurate supersolids and re-entrant transitions in an extended Bose-Hubbard ladder </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Madhusudan%2C+A+N">Ashwath N Madhusudan</a>, <a href="/search/quant-ph?searchtype=author&query=Santra%2C+G+C">Gopal Chandra Santra</a>, <a href="/search/quant-ph?searchtype=author&query=Kaur%2C+I">Inderpreet Kaur</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Nath%2C+R">Rejish Nath</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.20107v2-abstract-short" style="display: inline;"> We investigate the ground state phases of an extended Bose-Hubbard ladder of unit filling via the density-matrix-renormalization-group method and, in particular, the effect of rung-hoppings. In contrast to a single-chain, a commensurate supersolid emerges, and based on the Luttinger parameter, we classify them into two types. The latter leads to a reentrant gapless behavior as the onsite interacti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.20107v2-abstract-full').style.display = 'inline'; document.getElementById('2407.20107v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.20107v2-abstract-full" style="display: none;"> We investigate the ground state phases of an extended Bose-Hubbard ladder of unit filling via the density-matrix-renormalization-group method and, in particular, the effect of rung-hoppings. In contrast to a single-chain, a commensurate supersolid emerges, and based on the Luttinger parameter, we classify them into two types. The latter leads to a reentrant gapless behavior as the onsite interaction is increased while keeping all other parameters intact. A reentrant gapped transition is also found as a function of nearest-neighbor interactions. Further, we show that the string order characterizing the Haldane phase vanishes for a finite inter-chain hopping amplitude, however small it is. Finally, we propose two experimental platforms to observe our findings, using either dipolar atoms or polar molecules and Rydberg admixed atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.20107v2-abstract-full').style.display = 'none'; document.getElementById('2407.20107v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.15534">arXiv:2407.15534</a> <span> [<a href="https://arxiv.org/pdf/2407.15534">pdf</a>, <a href="https://arxiv.org/format/2407.15534">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> One-dimensional quantum dot array integrated with charge sensors in an InAs nanowire </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Luo%2C+Y">Yi Luo</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+X">Xiao-Fei Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Liu%2C+Z">Zhi-Hai Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weijie Li</a>, <a href="/search/quant-ph?searchtype=author&query=Yan%2C+S">Shili Yan</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+H">Han Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+H">Haitian Su</a>, <a href="/search/quant-ph?searchtype=author&query=Pan%2C+D">Dong Pan</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+J">Jianhua Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+J">Ji-Yin Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+H+Q">H. Q. Xu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.15534v1-abstract-short" style="display: inline;"> We report an experimental study of a one-dimensional quintuple-quantum-dot array integrated with two quantum dot charge sensors in an InAs nanowire. The device is studied by measuring double quantum dots formed consecutively in the array and corresponding charge stability diagrams are revealed with both direct current measurements and charge sensor signals. The one-dimensional quintuple-quantum-do… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.15534v1-abstract-full').style.display = 'inline'; document.getElementById('2407.15534v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.15534v1-abstract-full" style="display: none;"> We report an experimental study of a one-dimensional quintuple-quantum-dot array integrated with two quantum dot charge sensors in an InAs nanowire. The device is studied by measuring double quantum dots formed consecutively in the array and corresponding charge stability diagrams are revealed with both direct current measurements and charge sensor signals. The one-dimensional quintuple-quantum-dot array are then tuned up and its charge configurations are fully mapped out with the two charge sensors. The energy level of each dot in the array can be controlled individually by using a compensated gate architecture (i.e., "virtual gate"). After that, four dots in the array are selected to form two double quantum dots and ultra strong inter-double-dot interaction is obtained. A theoretical simulation based on a 4-dimensional Hamiltonian confirms the strong coupling strength between the two double quantum dots. The highly controllable one-dimensional quantum dot array achieved in this work is expected to be valuable for employing InAs nanowires to construct advanced quantum hardware in the future. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.15534v1-abstract-full').style.display = 'none'; document.getElementById('2407.15534v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.13098">arXiv:2407.13098</a> <span> [<a href="https://arxiv.org/pdf/2407.13098">pdf</a>, <a href="https://arxiv.org/format/2407.13098">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0218773">10.1063/5.0218773 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimal Tree Tensor Network Operators for Tensor Network Simulations: Applications to Open Quantum Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weitang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Ren%2C+J">Jiajun Ren</a>, <a href="/search/quant-ph?searchtype=author&query=Yang%2C+H">Hengrui Yang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+H">Haobin Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Shuai%2C+Z">Zhigang Shuai</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.13098v2-abstract-short" style="display: inline;"> Tree tensor network states (TTNS) decompose the system wavefunction to the product of low-rank tensors based on the tree topology, serving as the foundation of the multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) method. In this work, we present an algorithm that automatically constructs the optimal and exact tree tensor network operators (TTNO) for any sum-of-product symbolic qua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13098v2-abstract-full').style.display = 'inline'; document.getElementById('2407.13098v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.13098v2-abstract-full" style="display: none;"> Tree tensor network states (TTNS) decompose the system wavefunction to the product of low-rank tensors based on the tree topology, serving as the foundation of the multi-layer multi-configuration time-dependent Hartree (ML-MCTDH) method. In this work, we present an algorithm that automatically constructs the optimal and exact tree tensor network operators (TTNO) for any sum-of-product symbolic quantum operator.The construction is based on the minimum vertex cover of a bipartite graph. With the optimal TTNO, we simulate open quantum systems such as spin relaxation dynamics in the spin-boson model and charge transport in molecular junctions. In these simulations, the environment is treated as discrete modes and its wavefunction is evolved on equal footing with the system. We employ the Cole-Davidson spectral density to model the glassy phonon environment, and incorporate temperature effects via thermo field dynamics. Our results show that the computational cost scales linearly with the number of discretized modes, demonstrating the efficiency of our approach. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13098v2-abstract-full').style.display = 'none'; document.getElementById('2407.13098v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.12347">arXiv:2407.12347</a> <span> [<a href="https://arxiv.org/pdf/2407.12347">pdf</a>, <a href="https://arxiv.org/format/2407.12347">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Improved Nonlocality Certification via Bouncing between Bell Operators and Inequalities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Hu%2C+M">Mengyao Hu</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Lu%2C+Z">Zhide Lu</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Cui%2C+Z">Zhengyi Cui</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Pengfei Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+H">Hekang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Guo%2C+Q">Qiujiang Guo</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+Z">Zhen Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+D">Dong-Ling Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Song%2C+C">Chao Song</a> , et al. (3 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.12347v1-abstract-short" style="display: inline;"> Bell nonlocality is an intrinsic feature of quantum mechanics, which can be certified via the violation of Bell inequalities. It is therefore a fundamental question to certify Bell nonlocality from experimental data. Here, we present an optimization scheme to improve nonlocality certification by exploring flexible mappings between Bell inequalities and Hamiltonians corresponding to the Bell operat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.12347v1-abstract-full').style.display = 'inline'; document.getElementById('2407.12347v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.12347v1-abstract-full" style="display: none;"> Bell nonlocality is an intrinsic feature of quantum mechanics, which can be certified via the violation of Bell inequalities. It is therefore a fundamental question to certify Bell nonlocality from experimental data. Here, we present an optimization scheme to improve nonlocality certification by exploring flexible mappings between Bell inequalities and Hamiltonians corresponding to the Bell operators. We show that several Hamiltonian models can be mapped to new inequalities with improved classical bounds than the original one, enabling a more robust detection of nonlocality. From the other direction, we investigate the mapping from fixed Bell inequalities to Hamiltonians, aiming to maximize quantum violations while considering experimental imperfections. As a practical demonstration, we apply this method to an XXZ-like honeycomb-lattice model utilizing over 70 superconducting qubits. The successful application of this technique, as well as combining the two directions to form an optimization loop, may open new avenues for developing more practical and noise-resilient nonlocality certification techniques and enable broader experimental explorations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.12347v1-abstract-full').style.display = 'none'; document.getElementById('2407.12347v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 5 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.07688">arXiv:2407.07688</a> <span> [<a href="https://arxiv.org/pdf/2407.07688">pdf</a>, <a href="https://arxiv.org/ps/2407.07688">ps</a>, <a href="https://arxiv.org/format/2407.07688">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP09(2024)144">10.1007/JHEP09(2024)144 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Bosonic and fermionic coherence of N-partite states in the background of a dilaton black hole </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wen-Mei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+S">Shu-Min Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.07688v2-abstract-short" style="display: inline;"> We study the N-partite coherences of GHZ and W states for free bosonic and fermionic fields when any n observers hover near the event horizon of a Garfinkle-Horowitz-Strominger (GHS) dilaton black hole. We derive the more general analytical expressions for N-partite coherence, encompassing both physically accessible and inaccessible coherences in the context of the dilaton black hole. It has been… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.07688v2-abstract-full').style.display = 'inline'; document.getElementById('2407.07688v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.07688v2-abstract-full" style="display: none;"> We study the N-partite coherences of GHZ and W states for free bosonic and fermionic fields when any n observers hover near the event horizon of a Garfinkle-Horowitz-Strominger (GHS) dilaton black hole. We derive the more general analytical expressions for N-partite coherence, encompassing both physically accessible and inaccessible coherences in the context of the dilaton black hole. It has been found that the coherence of the bosonic field is greater than that of the fermionic field, while the entanglement of the fermionic field is greater than that of the bosonic field in dilaton spacetime. Additionally, the coherence of the W state is greater than that of the GHZ state, whereas the entanglement of the GHZ state is greater than that of the W state in curved spacetime. These results suggest that we should utilize suitable quantum resources and different types of particles for relativistic quantum information tasks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.07688v2-abstract-full').style.display = 'none'; document.getElementById('2407.07688v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 5 figures,</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JHEP 09 (2024) 144 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.05455">arXiv:2407.05455</a> <span> [<a href="https://arxiv.org/pdf/2407.05455">pdf</a>, <a href="https://arxiv.org/format/2407.05455">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum Supercritical Crossovers with Dynamical Singularity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Wang%2C+J">Junsen Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Lv%2C+E">Enze Lv</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+X">Xinyang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+Y">Yuliang Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.05455v2-abstract-short" style="display: inline;"> Supercriticality, characterized by strong fluctuations and a wealth of phenomena, emerges as an intriguing state beyond the classical liquid-gas critical point. In this study, we extend this notable concept to quantum many-body systems near the quantum critical point, by studying the quantum Ising model and Rydberg atom array through tensor network calculations and scaling analyses. We find two su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.05455v2-abstract-full').style.display = 'inline'; document.getElementById('2407.05455v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.05455v2-abstract-full" style="display: none;"> Supercriticality, characterized by strong fluctuations and a wealth of phenomena, emerges as an intriguing state beyond the classical liquid-gas critical point. In this study, we extend this notable concept to quantum many-body systems near the quantum critical point, by studying the quantum Ising model and Rydberg atom array through tensor network calculations and scaling analyses. We find two supercritical crossover lines in the quantum phase diagram with universal scaling, $h \propto (g - g_c)^{尾+ 纬}$, where $g$ ($h$) is the transverse (longitudinal) field, $g_c$ is the critical field, and $尾, 纬$ are the related critical exponents. Enclosed by the two crossover lines, there exist supercritical quantum states with universal behaviors in correlations and entanglement. In particular, we reveal a dynamical quantum phase transition occurring when traversing the quantum supercritical crossover line. These dynamical singularities, attributed to the intersection of Lee-Yang-Fisher zero lines with the real-time axis, have no counterpart in classical supercriticality. We propose that the Rydberg atom array offers an ideal platform for studying the quantum supercritical crossovers and measuring the critical exponents. The present work establishes a foundation for exploring quantum supercriticality and related phenomena in correlated many-body systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.05455v2-abstract-full').style.display = 'none'; document.getElementById('2407.05455v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Major revision, to be resubmit to PRL. 6 pages, 4 figures (SM 2 pages, 3 figures)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.17841">arXiv:2406.17841</a> <span> [<a href="https://arxiv.org/pdf/2406.17841">pdf</a>, <a href="https://arxiv.org/format/2406.17841">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Artificial Intelligence">cs.AI</span> </div> </div> <p class="title is-5 mathjax"> Probing many-body Bell correlation depth with superconducting qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Hu%2C+M">Mengyao Hu</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+T">Tingting Li</a>, <a href="/search/quant-ph?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Song%2C+Z">Zixuan Song</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+J">Jinfeng Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Dong%2C+H">Hang Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+X">Xu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Pengfei Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Jiang%2C+W">Wenjie Jiang</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.17841v1-abstract-short" style="display: inline;"> Quantum nonlocality describes a stronger form of quantum correlation than that of entanglement. It refutes Einstein's belief of local realism and is among the most distinctive and enigmatic features of quantum mechanics. It is a crucial resource for achieving quantum advantages in a variety of practical applications, ranging from cryptography and certified random number generation via self-testing… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.17841v1-abstract-full').style.display = 'inline'; document.getElementById('2406.17841v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.17841v1-abstract-full" style="display: none;"> Quantum nonlocality describes a stronger form of quantum correlation than that of entanglement. It refutes Einstein's belief of local realism and is among the most distinctive and enigmatic features of quantum mechanics. It is a crucial resource for achieving quantum advantages in a variety of practical applications, ranging from cryptography and certified random number generation via self-testing to machine learning. Nevertheless, the detection of nonlocality, especially in quantum many-body systems, is notoriously challenging. Here, we report an experimental certification of genuine multipartite Bell correlations, which signal nonlocality in quantum many-body systems, up to 24 qubits with a fully programmable superconducting quantum processor. In particular, we employ energy as a Bell correlation witness and variationally decrease the energy of a many-body system across a hierarchy of thresholds, below which an increasing Bell correlation depth can be certified from experimental data. As an illustrating example, we variationally prepare the low-energy state of a two-dimensional honeycomb model with 73 qubits and certify its Bell correlations by measuring an energy that surpasses the corresponding classical bound with up to 48 standard deviations. In addition, we variationally prepare a sequence of low-energy states and certify their genuine multipartite Bell correlations up to 24 qubits via energies measured efficiently by parity oscillation and multiple quantum coherence techniques. Our results establish a viable approach for preparing and certifying multipartite Bell correlations, which provide not only a finer benchmark beyond entanglement for quantum devices, but also a valuable guide towards exploiting multipartite Bell correlation in a wide spectrum of practical applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.17841v1-abstract-full').style.display = 'none'; document.getElementById('2406.17841v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages,6 figures + 14 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.19564">arXiv:2405.19564</a> <span> [<a href="https://arxiv.org/pdf/2405.19564">pdf</a>, <a href="https://arxiv.org/ps/2405.19564">ps</a>, <a href="https://arxiv.org/format/2405.19564">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum error detection with noise-resilient parity-controlled gate in two-dimensional Rydberg atom arrays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Guo%2C+F+Q">F. Q. Guo</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+S+L">S. L. Su</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Shao%2C+X+Q">X. Q. Shao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.19564v1-abstract-short" style="display: inline;"> Quantum error detection relies primarily on precise measurement of qubit parity, a fundamental operation in quantum information processing. Here, we introduce a resilient parity-controlled gate tailored for detecting quantum errors within a 2D Rydberg atom array. Our method enables the discrimination between even and odd parities of virtually excited control atoms by tracking the dynamic evolution… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.19564v1-abstract-full').style.display = 'inline'; document.getElementById('2405.19564v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.19564v1-abstract-full" style="display: none;"> Quantum error detection relies primarily on precise measurement of qubit parity, a fundamental operation in quantum information processing. Here, we introduce a resilient parity-controlled gate tailored for detecting quantum errors within a 2D Rydberg atom array. Our method enables the discrimination between even and odd parities of virtually excited control atoms by tracking the dynamic evolution of an auxiliary atom. Using spin-exchange dipolar interactions of Rydberg states and single- and two-photon driving between ground states and Rydberg states, our method speeds up Rydberg-parity measurements by a large amount compared to previous methods. In practical application, we explore three-qubit repetition codes, standard surface codes featuring stabilizers in the forms $ZZZZ$ and $XXXX$, as well as rotated surface codes in the $XZZX$ configuration, facilitating the measurement of stabilizers with a single-shot readout. We carry out thorough numerical simulations to evaluate the feasibility of our strategy, considering potential experimental imperfections such as undesired interactions between Rydberg states, fluctuations in atomic positions, dephasing noise, and laser amplitude inhomogeneities. Particular emphasis is placed on ensuring the reliability and advantages of the physical mechanisms of the parity meter. These results affirm the robustness and viability of our protocol, positioning it as a promising candidate for quantum error detection employing the Rydberg atom system in the foreseeable future. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.19564v1-abstract-full').style.display = 'none'; document.getElementById('2405.19564v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 17 figures, comments are welcome</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.17385">arXiv:2405.17385</a> <span> [<a href="https://arxiv.org/pdf/2405.17385">pdf</a>, <a href="https://arxiv.org/format/2405.17385">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Thermalization and Criticality on an Analog-Digital Quantum Simulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Andersen%2C+T+I">Trond I. Andersen</a>, <a href="/search/quant-ph?searchtype=author&query=Astrakhantsev%2C+N">Nikita Astrakhantsev</a>, <a href="/search/quant-ph?searchtype=author&query=Karamlou%2C+A+H">Amir H. Karamlou</a>, <a href="/search/quant-ph?searchtype=author&query=Berndtsson%2C+J">Julia Berndtsson</a>, <a href="/search/quant-ph?searchtype=author&query=Motruk%2C+J">Johannes Motruk</a>, <a href="/search/quant-ph?searchtype=author&query=Szasz%2C+A">Aaron Szasz</a>, <a href="/search/quant-ph?searchtype=author&query=Gross%2C+J+A">Jonathan A. Gross</a>, <a href="/search/quant-ph?searchtype=author&query=Schuckert%2C+A">Alexander Schuckert</a>, <a href="/search/quant-ph?searchtype=author&query=Westerhout%2C+T">Tom Westerhout</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+Y">Yaxing Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Forati%2C+E">Ebrahim Forati</a>, <a href="/search/quant-ph?searchtype=author&query=Rossi%2C+D">Dario Rossi</a>, <a href="/search/quant-ph?searchtype=author&query=Kobrin%2C+B">Bryce Kobrin</a>, <a href="/search/quant-ph?searchtype=author&query=Di+Paolo%2C+A">Agustin Di Paolo</a>, <a href="/search/quant-ph?searchtype=author&query=Klots%2C+A+R">Andrey R. Klots</a>, <a href="/search/quant-ph?searchtype=author&query=Drozdov%2C+I">Ilya Drozdov</a>, <a href="/search/quant-ph?searchtype=author&query=Kurilovich%2C+V+D">Vladislav D. Kurilovich</a>, <a href="/search/quant-ph?searchtype=author&query=Petukhov%2C+A">Andre Petukhov</a>, <a href="/search/quant-ph?searchtype=author&query=Ioffe%2C+L+B">Lev B. Ioffe</a>, <a href="/search/quant-ph?searchtype=author&query=Elben%2C+A">Andreas Elben</a>, <a href="/search/quant-ph?searchtype=author&query=Rath%2C+A">Aniket Rath</a>, <a href="/search/quant-ph?searchtype=author&query=Vitale%2C+V">Vittorio Vitale</a>, <a href="/search/quant-ph?searchtype=author&query=Vermersch%2C+B">Benoit Vermersch</a>, <a href="/search/quant-ph?searchtype=author&query=Acharya%2C+R">Rajeev Acharya</a>, <a href="/search/quant-ph?searchtype=author&query=Beni%2C+L+A">Laleh Aghababaie Beni</a> , et al. (202 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.17385v2-abstract-short" style="display: inline;"> Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators. Unlocking the full potential of such systems toward this goal requires flexible initial state preparation, precise time evolution, and extensive probes for final state characterization. We present a quantum simulator comprising 69 superconducting qubits which supports both universal qua… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.17385v2-abstract-full').style.display = 'inline'; document.getElementById('2405.17385v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.17385v2-abstract-full" style="display: none;"> Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators. Unlocking the full potential of such systems toward this goal requires flexible initial state preparation, precise time evolution, and extensive probes for final state characterization. We present a quantum simulator comprising 69 superconducting qubits which supports both universal quantum gates and high-fidelity analog evolution, with performance beyond the reach of classical simulation in cross-entropy benchmarking experiments. Emulating a two-dimensional (2D) XY quantum magnet, we leverage a wide range of measurement techniques to study quantum states after ramps from an antiferromagnetic initial state. We observe signatures of the classical Kosterlitz-Thouless phase transition, as well as strong deviations from Kibble-Zurek scaling predictions attributed to the interplay between quantum and classical coarsening of the correlated domains. This interpretation is corroborated by injecting variable energy density into the initial state, which enables studying the effects of the eigenstate thermalization hypothesis (ETH) in targeted parts of the eigenspectrum. Finally, we digitally prepare the system in pairwise-entangled dimer states and image the transport of energy and vorticity during thermalization. These results establish the efficacy of superconducting analog-digital quantum processors for preparing states across many-body spectra and unveiling their thermalization dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.17385v2-abstract-full').style.display = 'none'; document.getElementById('2405.17385v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.15326">arXiv:2405.15326</a> <span> [<a href="https://arxiv.org/pdf/2405.15326">pdf</a>, <a href="https://arxiv.org/format/2405.15326">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1751-8121/ad8a2b">10.1088/1751-8121/ad8a2b <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pseudo-hermitian Chebyshev differential matrix and non-Hermitian Liouville quantum mechanics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Lan%2C+C">Chen Lan</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Geng%2C+H">Huifang Geng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.15326v3-abstract-short" style="display: inline;"> The spectral collocation method (SCM) exhibits a clear superiority in solving ordinary and partial differential equations compared to conventional techniques, such as finite difference and finite element methods. This makes SCM a powerful tool for addressing the Schr枚dinger-like equations with boundary conditions in physics. However, the Chebyshev differential matrix (CDM), commonly used in SCM to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15326v3-abstract-full').style.display = 'inline'; document.getElementById('2405.15326v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.15326v3-abstract-full" style="display: none;"> The spectral collocation method (SCM) exhibits a clear superiority in solving ordinary and partial differential equations compared to conventional techniques, such as finite difference and finite element methods. This makes SCM a powerful tool for addressing the Schr枚dinger-like equations with boundary conditions in physics. However, the Chebyshev differential matrix (CDM), commonly used in SCM to replace the differential operator, is not Hermitian but pseudo-Hermitian. This non-Hermiticity subtly affects the pseudospectra and leads to a loss of completeness in the eigenstates. Consequently, several issues arise with these eigenstates. In this paper, we revisit the non-Hermitian Liouville quantum mechanics by emphasizing the pseudo-Hermiticity of the CDM and explore its expanded models. Furthermore, we demonstrate that the spectral instability can be influenced by the compactification parameter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15326v3-abstract-full').style.display = 'none'; document.getElementById('2405.15326v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 16 figures, typos fixed and references added. Final version appeared in J. Phys. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys. A: Math. Theor. 57 (2024): 465302 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.15144">arXiv:2405.15144</a> <span> [<a href="https://arxiv.org/pdf/2405.15144">pdf</a>, <a href="https://arxiv.org/format/2405.15144">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Ultra-sensitive solid-state organic molecular microwave quantum receiver </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+B">Bo Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Han%2C+Y">Yuchen Han</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+H">Hong-Liang Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+H">Hao Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Yang%2C+S">Shuo Yang</a>, <a href="/search/quant-ph?searchtype=author&query=Oxborrow%2C+M">Mark Oxborrow</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+Q">Qing Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Fu%2C+Y">Yue Fu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+Y">Yeliang Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zheng%2C+D">Dezhi Zheng</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+J">Jun Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.15144v1-abstract-short" style="display: inline;"> High-accuracy microwave sensing is widely demanded in various fields, ranging from cosmology to microwave quantum technology. Quantum receivers based on inorganic solid-state spin systems are promising candidates for such purpose because of the stability and compatibility, but their best sensitivity is currently limited to a few pT/$\sqrt{\rm{Hz}}$. Here, by utilising an enhanced readout scheme wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15144v1-abstract-full').style.display = 'inline'; document.getElementById('2405.15144v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.15144v1-abstract-full" style="display: none;"> High-accuracy microwave sensing is widely demanded in various fields, ranging from cosmology to microwave quantum technology. Quantum receivers based on inorganic solid-state spin systems are promising candidates for such purpose because of the stability and compatibility, but their best sensitivity is currently limited to a few pT/$\sqrt{\rm{Hz}}$. Here, by utilising an enhanced readout scheme with the state-of-the-art solid-state maser technology, we develop a robust microwave quantum receiver functioned by organic molecular spins at ambient conditions. Owing to the maser amplification, the sensitivity of the receiver achieves 6.14 $\pm$ 0.17 fT/$\sqrt{\rm{Hz}}$ which exceeds three orders of magnitude than that of the inorganic solid-state quantum receivers. The heterodyne detection without additional local oscillators improves bandwidth of the receiver and allows frequency detection. The scheme can be extended to other solid-state spin systems without complicated control pulses and thus enables practical applications such as electron spin resonance spectroscopy, dark matter searches, and astronomical observations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.15144v1-abstract-full').style.display = 'none'; document.getElementById('2405.15144v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.00770">arXiv:2405.00770</a> <span> [<a href="https://arxiv.org/pdf/2405.00770">pdf</a>, <a href="https://arxiv.org/format/2405.00770">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Complexity">cs.CC</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> </div> </div> <p class="title is-5 mathjax"> Quantum-Classical Separations in Shallow-Circuit-Based Learning with and without Noises </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+Z">Zhihan Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Gong%2C+W">Weiyuan Gong</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+D">Dong-Ling Deng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.00770v1-abstract-short" style="display: inline;"> We study quantum-classical separations between classical and quantum supervised learning models based on constant depth (i.e., shallow) circuits, in scenarios with and without noises. We construct a classification problem defined by a noiseless shallow quantum circuit and rigorously prove that any classical neural network with bounded connectivity requires logarithmic depth to output correctly wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.00770v1-abstract-full').style.display = 'inline'; document.getElementById('2405.00770v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.00770v1-abstract-full" style="display: none;"> We study quantum-classical separations between classical and quantum supervised learning models based on constant depth (i.e., shallow) circuits, in scenarios with and without noises. We construct a classification problem defined by a noiseless shallow quantum circuit and rigorously prove that any classical neural network with bounded connectivity requires logarithmic depth to output correctly with a larger-than-exponentially-small probability. This unconditional near-optimal quantum-classical separation originates from the quantum nonlocality property that distinguishes quantum circuits from their classical counterparts. We further derive the noise thresholds for demonstrating such a separation on near-term quantum devices under the depolarization noise model. We prove that this separation will persist if the noise strength is upper bounded by an inverse polynomial with respect to the system size, and vanish if the noise strength is greater than an inverse polylogarithmic function. In addition, for quantum devices with constant noise strength, we prove that no super-polynomial classical-quantum separation exists for any classification task defined by shallow Clifford circuits, independent of the structures of the circuits that specify the learning models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.00770v1-abstract-full').style.display = 'none'; document.getElementById('2405.00770v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.15685">arXiv:2404.15685</a> <span> [<a href="https://arxiv.org/pdf/2404.15685">pdf</a>, <a href="https://arxiv.org/format/2404.15685">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Super-resolution imaging based on active optical intensity interferometry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Liu%2C+L">Lu-Chuan Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+C">Cheng Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+Y">Yu-Ao Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wilczek%2C+F">Frank Wilczek</a>, <a href="/search/quant-ph?searchtype=author&query=Shao%2C+X">Xiao-Peng Shao</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+F">Feihu Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+Q">Qiang Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Pan%2C+J">Jian-Wei Pan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.15685v1-abstract-short" style="display: inline;"> Long baseline diffraction-limited optical aperture synthesis technology by interferometry plays an important role in scientific study and practical application. In contrast to amplitude (phase) interferometry, intensity interferometry -- which exploits the quantum nature of light to measure the photon bunching effect in thermal light -- is robust against atmospheric turbulence and optical defects.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.15685v1-abstract-full').style.display = 'inline'; document.getElementById('2404.15685v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.15685v1-abstract-full" style="display: none;"> Long baseline diffraction-limited optical aperture synthesis technology by interferometry plays an important role in scientific study and practical application. In contrast to amplitude (phase) interferometry, intensity interferometry -- which exploits the quantum nature of light to measure the photon bunching effect in thermal light -- is robust against atmospheric turbulence and optical defects. However, a thermal light source typically has a significant divergence angle and a low average photon number per mode, forestalling the applicability over long ranges. Here, we propose and demonstrate active intensity interferometry for super-resolution imaging over the kilometer range. Our scheme exploits phase-independent multiple laser emitters to produce the thermal illumination and uses an elaborate computational algorithm to reconstruct the image. In outdoor environments, we image two-dimension millimeter-level targets over 1.36 kilometers at a resolution of 14 times the diffraction limit of a single telescope. High-resolution optical imaging and sensing are anticipated by applying long-baseline active intensity interferometry in general branches of physics and metrology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.15685v1-abstract-full').style.display = 'none'; document.getElementById('2404.15685v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">42 pages, 11 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.14841">arXiv:2404.14841</a> <span> [<a href="https://arxiv.org/pdf/2404.14841">pdf</a>, <a href="https://arxiv.org/ps/2404.14841">ps</a>, <a href="https://arxiv.org/format/2404.14841">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Floquet dynamics of Rabi model beyond the counterrotating hybridized rotating wave method </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Han%2C+Y">Yingying Han</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+S">Shuanghao Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+M">Meijuan Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Guan%2C+Q">Q. Guan</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+W">Wenxian Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weidong Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.14841v1-abstract-short" style="display: inline;"> Monochromatically driven two-level systems (i.e., Rabi models) are ubiquitous in various fields of physics. Though they have been exactly solved, the physical pictures in these exact solutions are not clear. Recently, approximate analytical solutions with neat physics have been obtained by using the counterrotating hybridized rotating wave (CHRW) method, which has been proven to be effective over… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.14841v1-abstract-full').style.display = 'inline'; document.getElementById('2404.14841v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.14841v1-abstract-full" style="display: none;"> Monochromatically driven two-level systems (i.e., Rabi models) are ubiquitous in various fields of physics. Though they have been exactly solved, the physical pictures in these exact solutions are not clear. Recently, approximate analytical solutions with neat physics have been obtained by using the counterrotating hybridized rotating wave (CHRW) method, which has been proven to be effective over a wider range of parameters than the previous analytical solutions. However, the CHRW depends on a parameter 尉, which has no solution in some regimes. Here we combine the double-unitary-transformation approach with the generalized Van Vleck nearly degenerate perturbation theory, and present approximate analytical results with clear physics for almost all parameter regimes, which agree well with the numerical solutions and the previous experimental results. Moreover, the dynamic frequencies of the Rabi model are regular, and the frequency with the highest Fourier amplitude changes from the Rabi frequency to 2n蠅 with driving frequency 蠅 and integer n, as the driving intensity increases from weak to deep-strong. In addition, we further explore the Floquet dynamics of the dissipative open Rabi model. Remarkably, the dissipations are tunable in the rotating frame, and the approximate analytical results obtained by our method are in good agreement with the numerical results in the strong driving regime. These results pave the way to quantum control using strong and deep-strong driving with applications in quantum technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.14841v1-abstract-full').style.display = 'none'; document.getElementById('2404.14841v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.09487">arXiv:2404.09487</a> <span> [<a href="https://arxiv.org/pdf/2404.09487">pdf</a>, <a href="https://arxiv.org/format/2404.09487">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum Optimal Control Theory for the Shaping of Flying Qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Dong%2C+X">Xue Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Cao%2C+X">Xi Cao</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wen-Long Li</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+G">Guofeng Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Peng%2C+Z">Zhihui Peng</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+R">Re-Bing Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.09487v2-abstract-short" style="display: inline;"> The control of flying qubits carried by itinerant photons is ubiquitous in quantum networks. Beside their logical states, the shape of flying qubits must also be tailored for high-efficiency information transmission. In this paper, we introduce quantum optimal control theory to the shaping of flying qubits. Building on the flying-qubit control model established in our previous work, we design obje… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09487v2-abstract-full').style.display = 'inline'; document.getElementById('2404.09487v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.09487v2-abstract-full" style="display: none;"> The control of flying qubits carried by itinerant photons is ubiquitous in quantum networks. Beside their logical states, the shape of flying qubits must also be tailored for high-efficiency information transmission. In this paper, we introduce quantum optimal control theory to the shaping of flying qubits. Building on the flying-qubit control model established in our previous work, we design objective functionals for the generation of shaped flying qubits under practical constraints on the emitters and couplers. Numerical simulations employing gradient-descent algorithms demonstrate that the optimized control can effectively mitigate unwanted level and photon leakage caused by these non-idealities. Notably, while coherent control offers limited shaping capacity with a fixed coupler, it can significantly enhance the shaping performance when combined with a tunable coupler that has restricted tunability. The proposed optimal control framework provides a systematic approach to achieving high-quality control of flying qubits using realistic quantum devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09487v2-abstract-full').style.display = 'none'; document.getElementById('2404.09487v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.05330">arXiv:2404.05330</a> <span> [<a href="https://arxiv.org/pdf/2404.05330">pdf</a>, <a href="https://arxiv.org/format/2404.05330">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0211071">10.1063/5.0211071 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Rydberg superatoms: An artificial quantum system for quantum information processing and quantum optics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Shao%2C+X">Xiao-Qiang Shao</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+S">Shi-Lei Su</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+L">Lin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Nath%2C+R">Rejish Nath</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+J">Jin-Hui Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.05330v2-abstract-short" style="display: inline;"> Dense atom ensembles with Rydberg excitations display intriguing collective effects mediated by their strong, long-range dipole-dipole interactions. These collective effects, often modeled using Rydberg superatoms, have gained significant attention across various fields due to their potential applications in quantum information processing and quantum optics. In this review article, we delve into t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.05330v2-abstract-full').style.display = 'inline'; document.getElementById('2404.05330v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.05330v2-abstract-full" style="display: none;"> Dense atom ensembles with Rydberg excitations display intriguing collective effects mediated by their strong, long-range dipole-dipole interactions. These collective effects, often modeled using Rydberg superatoms, have gained significant attention across various fields due to their potential applications in quantum information processing and quantum optics. In this review article, we delve into the theoretical foundations of Rydberg interactions and explore experimental techniques for their manipulation and detection. We also discuss the latest advancements in harnessing Rydberg collective effects for quantum computation and optical quantum technologies. By synthesizing insights from theoretical studies and experimental demonstrations, we aim to provide a comprehensive overview of this rapidly evolving field and its potential impact on the future of quantum technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.05330v2-abstract-full').style.display = 'none'; document.getElementById('2404.05330v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised according to the comments of referees</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Rev. 11, 031320 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.00274">arXiv:2404.00274</a> <span> [<a href="https://arxiv.org/pdf/2404.00274">pdf</a>, <a href="https://arxiv.org/format/2404.00274">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> Imaging a Chain of Rydberg Superatoms Enabled by F枚rster-Resonance-Enhanced Interaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Du%2C+J">Jinjin Du</a>, <a href="/search/quant-ph?searchtype=author&query=Vogt%2C+T">Thibault Vogt</a>, <a href="/search/quant-ph?searchtype=author&query=Zheng%2C+N">Ningxuan Zheng</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenhui Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.00274v2-abstract-short" style="display: inline;"> We demonstrate single-shot and \textit{in situ} absorption imaging of individual Rydberg superatoms. This level of resolution is achieved using an electromagnetically induced transparency scheme involving a Rydberg energy level that is highly sensitive to the presence of Rydberg superatoms due to F枚rster-resonance-enhanced dipole couplings. Spectroscopic measurements illustrate the existence of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.00274v2-abstract-full').style.display = 'inline'; document.getElementById('2404.00274v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.00274v2-abstract-full" style="display: none;"> We demonstrate single-shot and \textit{in situ} absorption imaging of individual Rydberg superatoms. This level of resolution is achieved using an electromagnetically induced transparency scheme involving a Rydberg energy level that is highly sensitive to the presence of Rydberg superatoms due to F枚rster-resonance-enhanced dipole couplings. Spectroscopic measurements illustrate the existence of the F枚rster resonance and underscore the state-selectivity of the technique. With an imaging exposure time as short as 3 $渭$s, we successfully resolve linear chains of Rydberg superatoms excited in a one-dimensional configuration. The extracted second-order correlation shows strong anti-bunching due to excitation blockade, and a Fourier analysis reveals the long-range order in the chains of Rydberg superatoms. This imaging technique, with minimal destruction, will be of great interest for leveraging ensemble-encoded qubits in quantum computation and quantum simulation applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.00274v2-abstract-full').style.display = 'none'; document.getElementById('2404.00274v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.00091">arXiv:2404.00091</a> <span> [<a href="https://arxiv.org/pdf/2404.00091">pdf</a>, <a href="https://arxiv.org/format/2404.00091">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-024-02529-6">10.1038/s41567-024-02529-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Non-Abelian braiding of Fibonacci anyons with a superconducting processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Sun%2C+Z">Zheng-Zhi Sun</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+H">Hekang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Dong%2C+H">Hang Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+J">Jinfeng Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+X">Xu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/quant-ph?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Jiang%2C+W">Wenjie Jiang</a>, <a href="/search/quant-ph?searchtype=author&query=Yu%2C+L">Li-Wei Yu</a>, <a href="/search/quant-ph?searchtype=author&query=Song%2C+Z">Zixuan Song</a> , et al. (7 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.00091v1-abstract-short" style="display: inline;"> Non-Abelian topological orders offer an intriguing path towards fault-tolerant quantum computation, where information can be encoded and manipulated in a topologically protected manner immune to arbitrary local noises and perturbations. However, realizing non-Abelian topologically ordered states is notoriously challenging in both condensed matter and programmable quantum systems, and it was not un… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.00091v1-abstract-full').style.display = 'inline'; document.getElementById('2404.00091v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.00091v1-abstract-full" style="display: none;"> Non-Abelian topological orders offer an intriguing path towards fault-tolerant quantum computation, where information can be encoded and manipulated in a topologically protected manner immune to arbitrary local noises and perturbations. However, realizing non-Abelian topologically ordered states is notoriously challenging in both condensed matter and programmable quantum systems, and it was not until recently that signatures of non-Abelian statistics were observed through digital quantum simulation approaches. Despite these exciting progresses, none of them has demonstrated the appropriate type of topological orders and associated non-Abelian anyons whose braidings alone support universal quantum computation. Here, we report the realization of non-Abelian topologically ordered states of the Fibonacci string-net model and demonstrate braidings of Fibonacci anyons featuring universal computational power, with a superconducting quantum processor. We exploit efficient quantum circuits to prepare the desired states and verify their nontrivial topological nature by measuring the topological entanglement entropy. In addition, we create two pairs of Fibonacci anyons and demonstrate their fusion rule and non-Abelian braiding statistics by applying unitary gates on the underlying physical qubits. Our results establish a versatile digital approach to exploring exotic non-Abelian topological states and their associated braiding statistics with current noisy intermediate-scale quantum processors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.00091v1-abstract-full').style.display = 'none'; document.getElementById('2404.00091v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.07042">arXiv:2403.07042</a> <span> [<a href="https://arxiv.org/pdf/2403.07042">pdf</a>, <a href="https://arxiv.org/format/2403.07042">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1134/S1995080224603849">10.1134/S1995080224603849 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Supercomputer model of finite-dimensional quantum electrodynamics applications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wanshun Li</a>, <a href="/search/quant-ph?searchtype=author&query=Miao%2C+H">Hui-hui Miao</a>, <a href="/search/quant-ph?searchtype=author&query=Ozhigov%2C+Y+I">Yuri Igorevich Ozhigov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.07042v3-abstract-short" style="display: inline;"> A general scheme is given for supercomputer simulation of quantum processes, which are described by various modifications of finite-dimensional cavity quantum electrodynamics models, including Jaynes-Cummings-Hubbard model and Tavis-Cummings-Hubbard model. Conclusions and recommendations are illustrated using two examples: approximate model of hydrogen bonding and model of photon motion on a two-d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.07042v3-abstract-full').style.display = 'inline'; document.getElementById('2403.07042v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.07042v3-abstract-full" style="display: none;"> A general scheme is given for supercomputer simulation of quantum processes, which are described by various modifications of finite-dimensional cavity quantum electrodynamics models, including Jaynes-Cummings-Hubbard model and Tavis-Cummings-Hubbard model. Conclusions and recommendations are illustrated using two examples: approximate model of hydrogen bonding and model of photon motion on a two-dimensional plane. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.07042v3-abstract-full').style.display = 'none'; document.getElementById('2403.07042v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Lobachevskii Journal of Mathematics 45, 3097-3106 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.00210">arXiv:2403.00210</a> <span> [<a href="https://arxiv.org/pdf/2403.00210">pdf</a>, <a href="https://arxiv.org/ps/2403.00210">ps</a>, <a href="https://arxiv.org/format/2403.00210">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0192602">10.1063/5.0192602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dissipative stabilization of high-dimensional GHZ states for neutral atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+Y">Yue Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Yang%2C+Y">Yu-Qing Yang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Shao%2C+X">Xiao-Qiang Shao</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.00210v1-abstract-short" style="display: inline;"> High-dimensional quantum entanglement characterizes the entanglement of quantum systems within a larger Hilbert space, introducing more intricate and complex correlations among the entangled particles' states. The high-dimensional Greenberger-Horne-Zeilinger (GHZ) state, symbolic of this type of entanglement, is of significant importance in various quantum information processing applications. This… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.00210v1-abstract-full').style.display = 'inline'; document.getElementById('2403.00210v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.00210v1-abstract-full" style="display: none;"> High-dimensional quantum entanglement characterizes the entanglement of quantum systems within a larger Hilbert space, introducing more intricate and complex correlations among the entangled particles' states. The high-dimensional Greenberger-Horne-Zeilinger (GHZ) state, symbolic of this type of entanglement, is of significant importance in various quantum information processing applications. This study proposes integrating a neutral atom platform with quantum reservoir engineering to generate a high-dimensional GHZ state deterministically. Leveraging the advantages of neutral atoms in a modified unconventional Rydberg pumping mechanism, combined with controlled dissipation, we achieve a three-dimensional GHZ state with a fidelity surpassing 99\% through multiple pump and dissipation cycles. This innovative approach paves the way for experimentally feasible, deterministic preparation of high-dimensional GHZ states in Rydberg atom systems, thereby advancing the capabilities of quantum information processing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.00210v1-abstract-full').style.display = 'none'; document.getElementById('2403.00210v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by Applied Physics Letters, 7 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Lett. 124, 114001 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.05778">arXiv:2402.05778</a> <span> [<a href="https://arxiv.org/pdf/2402.05778">pdf</a>, <a href="https://arxiv.org/format/2402.05778">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Lattice">hep-lat</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> The $蠁^n$ trajectory bootstrap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenliang Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.05778v3-abstract-short" style="display: inline;"> We perform an extensive bootstrap study of Hermitian and non-Hermitian theories based on the novel analytic continuation of $\langle蠁^n\rangle$ or $\langle(i蠁)^n\rangle$ in $n$. We first use the quantum harmonic oscillator to illustrate various aspects of the $蠁^n$ trajectory bootstrap method, such as the large $n$ expansion, matching conditions, exact quantization condition, and high energy asymp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05778v3-abstract-full').style.display = 'inline'; document.getElementById('2402.05778v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.05778v3-abstract-full" style="display: none;"> We perform an extensive bootstrap study of Hermitian and non-Hermitian theories based on the novel analytic continuation of $\langle蠁^n\rangle$ or $\langle(i蠁)^n\rangle$ in $n$. We first use the quantum harmonic oscillator to illustrate various aspects of the $蠁^n$ trajectory bootstrap method, such as the large $n$ expansion, matching conditions, exact quantization condition, and high energy asymptotic behavior. Then we derive highly accurate solutions for the anharmonic oscillators with the parity invariant potential $V(蠁)=蠁^2+蠁^{m}$ and the $\mathcal{PT}$ invariant potential $V(蠁)=-(i蠁)^{m}$ for a large range of integral $m$, showing the high efficiency and general applicability of this new bootstrap approach. For the Hermitian quartic and non-Hermitian cubic oscillators, we further verify that the non-integer $n$ results for $\langle蠁^n\rangle$ or $\langle(i蠁)^n\rangle$ are consistent with those from the wave function approach. In the $\mathcal{PT}$ invariant case, the existence of $\langle(i蠁)^n\rangle$ with non-integer $n$ allows us to bootstrap the non-Hermitian theories with non-integer powers, such as fractional and irrational $m$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05778v3-abstract-full').style.display = 'none'; document.getElementById('2402.05778v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">v3: 21 pages, 9 figures, abstract and introduction rewritten, many minor improvements made, hopefully more reader-friendly; v2: 24 pages, 9 figures, irrational example added, typos corrected, discussion improved, references added</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.15951">arXiv:2401.15951</a> <span> [<a href="https://arxiv.org/pdf/2401.15951">pdf</a>, <a href="https://arxiv.org/format/2401.15951">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Observation of quantum strong Mpemba effect </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+J">Jie Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Xia%2C+G">Gang Xia</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+C">Chun-Wang Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+T">Ting Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+Q">Qian Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Xie%2C+Y">Yi Xie</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+W">Wen-Bo Su</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+W">Wei Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Qiu%2C+C">Cheng-Wei Qiu</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+P">Ping-xing Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Jing%2C+H">Hui Jing</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+Y">Yan-Li Zhou</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.15951v2-abstract-short" style="display: inline;"> An ancient and counterintuitive phenomenon know as the Mpemba effect (water can cool faster when initially heated up) showcases the critical role of initial conditions in relaxation processes. How to realize and utilize this effect for speeding up relaxation is an important but challenging task in purely quantum system till now. Here, we report the first experiment, as far as we know,about the str… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.15951v2-abstract-full').style.display = 'inline'; document.getElementById('2401.15951v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.15951v2-abstract-full" style="display: none;"> An ancient and counterintuitive phenomenon know as the Mpemba effect (water can cool faster when initially heated up) showcases the critical role of initial conditions in relaxation processes. How to realize and utilize this effect for speeding up relaxation is an important but challenging task in purely quantum system till now. Here, we report the first experiment, as far as we know,about the strong Mpemba effect in a single trapped ion system in which an exponentially expedited relaxation in time is observed by preparing an optimal initial state with no excitation of the slowest decaying mode. Also, we find that the condition of realizing such effect coincides with the Liouvillian exceptional point, featuring the coalescence of both the eigenvalues and the eigenmodes of the system. Our work provides an efficient strategy to exponentially accelerate relaxations of quantum system to their stationary state, and suggests a link unexplored yet between the Mpemba effect and the non-Hermitian physics. It could open up the door to engineer a wide range of dissipative quantum systems by utilizing the anomalous Mpemba effect, for applications in quantum simulation and quantum information processing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.15951v2-abstract-full').style.display = 'none'; document.getElementById('2401.15951v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by Nature Communications</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.05619">arXiv:2401.05619</a> <span> [<a href="https://arxiv.org/pdf/2401.05619">pdf</a>, <a href="https://arxiv.org/format/2401.05619">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Frequency tuning of a squeezed vacuum state using interferometric enhanced Bragg diffraction effect </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Deng%2C+Q">Qiqi Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenqi Li</a>, <a href="/search/quant-ph?searchtype=author&query=Guo%2C+X">Xueshi Guo</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+X">Xiaoying Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.05619v1-abstract-short" style="display: inline;"> We experimentally demonstrate the optical frequency tuning of a squeezed vacuum state generated from an optical parametric oscillator by using an acousto-optic modulator based bi-frequency interferometer. The systematic efficiency of the frequency tuning device is $91\%$, which is only confined by the optical transmission efficiency of the acousto-optic modulators. The amount of frequency tuning i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05619v1-abstract-full').style.display = 'inline'; document.getElementById('2401.05619v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.05619v1-abstract-full" style="display: none;"> We experimentally demonstrate the optical frequency tuning of a squeezed vacuum state generated from an optical parametric oscillator by using an acousto-optic modulator based bi-frequency interferometer. The systematic efficiency of the frequency tuning device is $91\%$, which is only confined by the optical transmission efficiency of the acousto-optic modulators. The amount of frequency tuning is 80 MHz, which is orders of magnitude larger than the line-width of the laser used to generate the squeezed state, and can in principle be further extended to GHz range. Our investigation shows the interferometric enhanced Bragg diffraction effect can be applied to a variety of other quantum optical states as well, and will serve as a handy tool for quantum network. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05619v1-abstract-full').style.display = 'none'; document.getElementById('2401.05619v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.04910">arXiv:2401.04910</a> <span> [<a href="https://arxiv.org/pdf/2401.04910">pdf</a>, <a href="https://arxiv.org/format/2401.04910">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.jctc.4c00155">10.1021/acs.jctc.4c00155 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Efficient and Robust Parameter Optimization of the Unitary Coupled-Cluster Ansatz </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weitang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Ge%2C+Y">Yufei Ge</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+S">Shixin Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+Y">Yuqin Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+S">Shengyu Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.04910v2-abstract-short" style="display: inline;"> The variational quantum eigensolver (VQE) framework has been instrumental in advancing near-term quantum algorithms. However, parameter optimization remains a significant bottleneck for VQE, requiring a large number of measurements for successful algorithm execution. In this paper, we propose sequential optimization with approximate parabola (SOAP) as an efficient and robust optimizer specifically… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04910v2-abstract-full').style.display = 'inline'; document.getElementById('2401.04910v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.04910v2-abstract-full" style="display: none;"> The variational quantum eigensolver (VQE) framework has been instrumental in advancing near-term quantum algorithms. However, parameter optimization remains a significant bottleneck for VQE, requiring a large number of measurements for successful algorithm execution. In this paper, we propose sequential optimization with approximate parabola (SOAP) as an efficient and robust optimizer specifically designed for parameter optimization of the unitary coupled-cluster ansatz on quantum computers. SOAP leverages sequential optimization and approximates the energy landscape as quadratic functions, minimizing the number of energy evaluations required to optimize each parameter. To capture parameter correlations, SOAP incorporates the average direction from the previous iteration into the optimization direction set. Numerical benchmark studies on molecular systems demonstrate that SOAP achieves significantly faster convergence and greater robustness to noise compared to traditional optimization methods. Furthermore, numerical simulations up to 20 qubits reveal that SOAP scales well with the number of parameters in the ansatz. The exceptional performance of SOAP is further validated through experiments on a superconducting quantum computer using a 2-qubit model system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04910v2-abstract-full').style.display = 'none'; document.getElementById('2401.04910v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.04333">arXiv:2401.04333</a> <span> [<a href="https://arxiv.org/pdf/2401.04333">pdf</a>, <a href="https://arxiv.org/format/2401.04333">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-024-53077-9">10.1038/s41467-024-53077-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Long-lived topological time-crystalline order on a quantum processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Xiang%2C+L">Liang Xiang</a>, <a href="/search/quant-ph?searchtype=author&query=Jiang%2C+W">Wenjie Jiang</a>, <a href="/search/quant-ph?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/quant-ph?searchtype=author&query=Song%2C+Z">Zixuan Song</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/quant-ph?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/quant-ph?searchtype=author&query=Cui%2C+Z">Zhengyi Cui</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+T">Tingting Li</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+J">Jinfeng Deng</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+X">Xu Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Dong%2C+H">Hang Dong</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+P">Pengfei Zhang</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.04333v1-abstract-short" style="display: inline;"> Topologically ordered phases of matter elude Landau's symmetry-breaking theory, featuring a variety of intriguing properties such as long-range entanglement and intrinsic robustness against local perturbations. Their extension to periodically driven systems gives rise to exotic new phenomena that are forbidden in thermal equilibrium. Here, we report the observation of signatures of such a phenomen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04333v1-abstract-full').style.display = 'inline'; document.getElementById('2401.04333v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.04333v1-abstract-full" style="display: none;"> Topologically ordered phases of matter elude Landau's symmetry-breaking theory, featuring a variety of intriguing properties such as long-range entanglement and intrinsic robustness against local perturbations. Their extension to periodically driven systems gives rise to exotic new phenomena that are forbidden in thermal equilibrium. Here, we report the observation of signatures of such a phenomenon -- a prethermal topologically ordered time crystal -- with programmable superconducting qubits arranged on a square lattice. By periodically driving the superconducting qubits with a surface-code Hamiltonian, we observe discrete time-translation symmetry breaking dynamics that is only manifested in the subharmonic temporal response of nonlocal logical operators. We further connect the observed dynamics to the underlying topological order by measuring a nonzero topological entanglement entropy and studying its subsequent dynamics. Our results demonstrate the potential to explore exotic topologically ordered nonequilibrium phases of matter with noisy intermediate-scale quantum processors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04333v1-abstract-full').style.display = 'none'; document.getElementById('2401.04333v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages (main text), 16 pages (supplementary information)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.03759">arXiv:2401.03759</a> <span> [<a href="https://arxiv.org/pdf/2401.03759">pdf</a>, <a href="https://arxiv.org/format/2401.03759">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41598-024-67897-8">10.1038/s41598-024-67897-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Hybrid Quantum Computing Pipeline for Real World Drug Discovery </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weitang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Yin%2C+Z">Zhi Yin</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+X">Xiaoran Li</a>, <a href="/search/quant-ph?searchtype=author&query=Ma%2C+D">Dongqiang Ma</a>, <a href="/search/quant-ph?searchtype=author&query=Yi%2C+S">Shuang Yi</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+Z">Zhenxing Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Zou%2C+C">Chenji Zou</a>, <a href="/search/quant-ph?searchtype=author&query=Bu%2C+K">Kunliang Bu</a>, <a href="/search/quant-ph?searchtype=author&query=Dai%2C+M">Maochun Dai</a>, <a href="/search/quant-ph?searchtype=author&query=Yue%2C+J">Jie Yue</a>, <a href="/search/quant-ph?searchtype=author&query=Chen%2C+Y">Yuzong Chen</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+X">Xiaojin Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+S">Shengyu Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.03759v3-abstract-short" style="display: inline;"> Quantum computing, with its superior computational capabilities compared to classical approaches, holds the potential to revolutionize numerous scientific domains, including pharmaceuticals. However, the application of quantum computing for drug discovery has primarily been limited to proof-of-concept studies, which often fail to capture the intricacies of real-world drug development challenges. I… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.03759v3-abstract-full').style.display = 'inline'; document.getElementById('2401.03759v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.03759v3-abstract-full" style="display: none;"> Quantum computing, with its superior computational capabilities compared to classical approaches, holds the potential to revolutionize numerous scientific domains, including pharmaceuticals. However, the application of quantum computing for drug discovery has primarily been limited to proof-of-concept studies, which often fail to capture the intricacies of real-world drug development challenges. In this study, we diverge from conventional investigations by developing \rev{a hybrid} quantum computing pipeline tailored to address genuine drug design problems. Our approach underscores the application of quantum computation in drug discovery and propels it towards more scalable system. We specifically construct our versatile quantum computing pipeline to address two critical tasks in drug discovery: the precise determination of Gibbs free energy profiles for prodrug activation involving covalent bond cleavage, and the accurate simulation of covalent bond interactions. This work serves as a pioneering effort in benchmarking quantum computing against veritable scenarios encountered in drug design, especially the covalent bonding issue present in both of the case studies, thereby transitioning from theoretical models to tangible applications. Our results demonstrate the potential of a quantum computing pipeline for integration into real world drug design workflows. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.03759v3-abstract-full').style.display = 'none'; document.getElementById('2401.03759v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.14718">arXiv:2312.14718</a> <span> [<a href="https://arxiv.org/pdf/2312.14718">pdf</a>, <a href="https://arxiv.org/format/2312.14718">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.6.023223">10.1103/PhysRevResearch.6.023223 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tripartite quantum Rabi model with trapped Rydberg ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Hamlyn%2C+T+J">Thomas J. Hamlyn</a>, <a href="/search/quant-ph?searchtype=author&query=Zhang%2C+C">Chi Zhang</a>, <a href="/search/quant-ph?searchtype=author&query=Lesanovsky%2C+I">Igor Lesanovsky</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.14718v2-abstract-short" style="display: inline;"> We investigate a tripartite quantum Rabi model (TQRM) wherein a bosonic mode concurrently couples to two spin-$1/2$ particles through a spin-spin interaction, resulting in a spin-spin-boson coupling -- a departure from conventional quantum Rabi models featuring bipartite spin-boson couplings. The symmetries of the TQRM depend on the detuning parameter, representing the energy difference between th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.14718v2-abstract-full').style.display = 'inline'; document.getElementById('2312.14718v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.14718v2-abstract-full" style="display: none;"> We investigate a tripartite quantum Rabi model (TQRM) wherein a bosonic mode concurrently couples to two spin-$1/2$ particles through a spin-spin interaction, resulting in a spin-spin-boson coupling -- a departure from conventional quantum Rabi models featuring bipartite spin-boson couplings. The symmetries of the TQRM depend on the detuning parameter, representing the energy difference between the spin states. At zero detuning a parity symmetry renders the TQRM reducible to a quantum Rabi model. A subradiant to superradiant transition in the groundstate is predicted as the tripartite coupling strength increases. For non-zero detuning the total spin emerges as the sole conserved quantity in the TQRM. It is found that superradiance prevails in the groundstate as long as the tripartite coupling remains non-zero. We derive the Braak $\mathcal{G}$-function of the TQRM analytically, with which the eigenspectra are obtained. The TQRM can be realized in a viable trapped Rydberg ion quantum simulator, where the required tripartite couplings and single body interactions in the TQRM are naturally present. Our study opens opportunities to explore and create novel correlations and entanglement in the spin and motional degrees of freedoms with the TQRM. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.14718v2-abstract-full').style.display = 'none'; document.getElementById('2312.14718v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">v1: 11 pages; 9 figures, v2: 13 pages; 10 figures (updated to reflect published version, content rearranged and extra details added in appendix on how to engineer correct interaction term with Rydberg ions)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 6, 023223 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.04420">arXiv:2312.04420</a> <span> [<a href="https://arxiv.org/pdf/2312.04420">pdf</a>, <a href="https://arxiv.org/format/2312.04420">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Finite-Temperature Simulations of Quantum Lattice Models with Stochastic Matrix Product States </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Gao%2C+J">Jianxin Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Gao%2C+Y">Yuan Gao</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Q">Qiaoyi Li</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.04420v1-abstract-short" style="display: inline;"> In this work, we develop a stochastic matrix product state (stoMPS) approach that combines the MPS technique and Monte Carlo samplings and can be applied to simulate quantum lattice models down to low temperature. In particular, we exploit a procedure to unbiasedly sample the local tensors in the matrix product states, which has one physical index of dimension $d$ and two geometric indices of dime… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04420v1-abstract-full').style.display = 'inline'; document.getElementById('2312.04420v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.04420v1-abstract-full" style="display: none;"> In this work, we develop a stochastic matrix product state (stoMPS) approach that combines the MPS technique and Monte Carlo samplings and can be applied to simulate quantum lattice models down to low temperature. In particular, we exploit a procedure to unbiasedly sample the local tensors in the matrix product states, which has one physical index of dimension $d$ and two geometric indices of dimension $D$, and find the results can be continuously improved by enlarging $D$. We benchmark the methods on small system sizes and then compare the results to those obtained with minimally entangled typical thermal states, finding that stoMPS has overall better performance with finite $D$. We further exploit the MPS sampling to simulate long spin chains, as well as the triangular and square lattices with cylinder circumference $W$ up to 4. Our results showcase the accuracy and effectiveness of stochastic tensor networks in finite-temperature simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04420v1-abstract-full').style.display = 'none'; document.getElementById('2312.04420v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.16998">arXiv:2311.16998</a> <span> [<a href="https://arxiv.org/pdf/2311.16998">pdf</a>, <a href="https://arxiv.org/format/2311.16998">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Spectral signatures of vibronic coupling in trapped cold atomic Rydberg systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Wilkinson%2C+J+W+P">Joseph W. P. Wilkinson</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weibin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Lesanovsky%2C+I">Igor Lesanovsky</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.16998v1-abstract-short" style="display: inline;"> Atoms and ions confined with electric and optical fields form the basis of many current quantum simulation and computing platforms. When excited to high-lying Rydberg states, long-ranged dipole interactions emerge which strongly couple the electronic and vibrational degrees of freedom through state-dependent forces. This vibronic coupling and the ensuing hybridization of internal and external degr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.16998v1-abstract-full').style.display = 'inline'; document.getElementById('2311.16998v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.16998v1-abstract-full" style="display: none;"> Atoms and ions confined with electric and optical fields form the basis of many current quantum simulation and computing platforms. When excited to high-lying Rydberg states, long-ranged dipole interactions emerge which strongly couple the electronic and vibrational degrees of freedom through state-dependent forces. This vibronic coupling and the ensuing hybridization of internal and external degrees of freedom manifest through clear signatures in the many-body spectrum. We illustrate this by considering the case of two trapped Rydberg ions, for which the interaction between the relative vibrations and Rydberg states realizes a quantum Rabi model. We proceed to demonstrate that the aforementioned hybridization can be probed by radio frequency spectroscopy and discuss observable spectral signatures at finite temperatures and for larger ion crystals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.16998v1-abstract-full').style.display = 'none'; document.getElementById('2311.16998v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 + 12 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.14302">arXiv:2311.14302</a> <span> [<a href="https://arxiv.org/pdf/2311.14302">pdf</a>, <a href="https://arxiv.org/format/2311.14302">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.109.035119">10.1103/PhysRevB.109.035119 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Universal scalefree non-Hermitian skin effect near the Bloch point </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wei Li</a>, <a href="/search/quant-ph?searchtype=author&query=Sun%2C+Z">Zhoujian Sun</a>, <a href="/search/quant-ph?searchtype=author&query=Yang%2C+Z">Ze Yang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+F">Fuxiang Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.14302v2-abstract-short" style="display: inline;"> The scalefree non-Hermitian skin effect (NHSE) refers to the phenomenon that the localization length of skin modes scales proportionally with system size in non-Hermitian systems. Authors of recent studies have demonstrated that the scalefree NHSE can be induced through various mechanisms, including the critical NHSE, local non-Hermiticity, and the boundary impurity effect. Nevertheless, these met… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.14302v2-abstract-full').style.display = 'inline'; document.getElementById('2311.14302v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.14302v2-abstract-full" style="display: none;"> The scalefree non-Hermitian skin effect (NHSE) refers to the phenomenon that the localization length of skin modes scales proportionally with system size in non-Hermitian systems. Authors of recent studies have demonstrated that the scalefree NHSE can be induced through various mechanisms, including the critical NHSE, local non-Hermiticity, and the boundary impurity effect. Nevertheless, these methods require careful modeling and precise parameter tuning. In contrast, in this paper, we suggest that the scalefree NHSE is a universal phenomenon, observable in extensive systems if these systems can be described by non-Bloch band theory and host Bloch points on the energy spectrum in the thermodynamic limit. Crucially, we discover that the geometry of the generalized Brillouin zone determines the scaling rule of the localization length, which can scale either linearly or quadratically with the system size. In this paper, we enriches the phenomenon of the scalefree NHSE. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.14302v2-abstract-full').style.display = 'none'; document.getElementById('2311.14302v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 109 (2024) 035119 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.11951">arXiv:2311.11951</a> <span> [<a href="https://arxiv.org/pdf/2311.11951">pdf</a>, <a href="https://arxiv.org/format/2311.11951">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10773-022-05048-3">10.1007/s10773-022-05048-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An Improved Quantum Private Set Intersection Protocol Based on Hadamard Gates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Liu%2C+W">Wenjie Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenbo Li</a>, <a href="/search/quant-ph?searchtype=author&query=Wang%2C+H">Haibin Wang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.11951v1-abstract-short" style="display: inline;"> Recently, Liu and Yin (Int. J. Theor. Phys. 60, 2074-2083 (2021)) proposed a two-party private set intersection protocol based on quantum Fourier transform. We find the participant can deduce the other party's private information, which violates the security requirement of private set computation. In order to solve this problem, an improved private set intersection protocol based on Hadamard gate… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.11951v1-abstract-full').style.display = 'inline'; document.getElementById('2311.11951v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.11951v1-abstract-full" style="display: none;"> Recently, Liu and Yin (Int. J. Theor. Phys. 60, 2074-2083 (2021)) proposed a two-party private set intersection protocol based on quantum Fourier transform. We find the participant can deduce the other party's private information, which violates the security requirement of private set computation. In order to solve this problem, an improved private set intersection protocol based on Hadamard gate is proposed. Firstly, the more feasible Hadamard gates are used to perform on the original n qubits instead of the quantum Fourier transform, which may reduce the difficulty of implementation. In addition, through the exclusive OR calculation, the participant's private information is randomly chosen and encoded on the additional n qubits, which prevents participants from obtaining the result of the difference set S-diff , and then avoids the internal leakage of private information. Finally, the correctness and security analysis are conducted to show the proposed protocol can guarantee the correctness of computation result as well as resist outside attacks and participant internal attacks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.11951v1-abstract-full').style.display = 'none'; document.getElementById('2311.11951v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 1 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> International Journal of Theoretical Physics,2022.61(3):p.53 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.04965">arXiv:2311.04965</a> <span> [<a href="https://arxiv.org/pdf/2311.04965">pdf</a>, <a href="https://arxiv.org/format/2311.04965">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Artificial Intelligence">cs.AI</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> </div> </div> <p class="title is-5 mathjax"> Expressibility-induced Concentration of Quantum Neural Tangent Kernels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Yu%2C+L">Li-Wei Yu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Weikang Li</a>, <a href="/search/quant-ph?searchtype=author&query=Ye%2C+Q">Qi Ye</a>, <a href="/search/quant-ph?searchtype=author&query=Lu%2C+Z">Zhide Lu</a>, <a href="/search/quant-ph?searchtype=author&query=Han%2C+Z">Zizhao Han</a>, <a href="/search/quant-ph?searchtype=author&query=Deng%2C+D">Dong-Ling Deng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.04965v1-abstract-short" style="display: inline;"> Quantum tangent kernel methods provide an efficient approach to analyzing the performance of quantum machine learning models in the infinite-width limit, which is of crucial importance in designing appropriate circuit architectures for certain learning tasks. Recently, they have been adapted to describe the convergence rate of training errors in quantum neural networks in an analytical manner. Her… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.04965v1-abstract-full').style.display = 'inline'; document.getElementById('2311.04965v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.04965v1-abstract-full" style="display: none;"> Quantum tangent kernel methods provide an efficient approach to analyzing the performance of quantum machine learning models in the infinite-width limit, which is of crucial importance in designing appropriate circuit architectures for certain learning tasks. Recently, they have been adapted to describe the convergence rate of training errors in quantum neural networks in an analytical manner. Here, we study the connections between the trainability and expressibility of quantum tangent kernel models. In particular, for global loss functions, we rigorously prove that high expressibility of both the global and local quantum encodings can lead to exponential concentration of quantum tangent kernel values to zero. Whereas for local loss functions, such issue of exponential concentration persists owing to the high expressibility, but can be partially mitigated. We further carry out extensive numerical simulations to support our analytical theories. Our discoveries unveil a pivotal characteristic of quantum neural tangent kernels, offering valuable insights for the design of wide quantum variational circuit models in practical applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.04965v1-abstract-full').style.display = 'none'; document.getElementById('2311.04965v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages,6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.12389">arXiv:2310.12389</a> <span> [<a href="https://arxiv.org/pdf/2310.12389">pdf</a>, <a href="https://arxiv.org/format/2310.12389">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Networking and Internet Architecture">cs.NI</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Quantum Computing for MIMO Beam Selection Problem: Model and Optical Experimental Solution </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Huang%2C+Y">Yuhong Huang</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenxin Li</a>, <a href="/search/quant-ph?searchtype=author&query=Pan%2C+C">Chengkang Pan</a>, <a href="/search/quant-ph?searchtype=author&query=Hou%2C+S">Shuai Hou</a>, <a href="/search/quant-ph?searchtype=author&query=Lu%2C+X">Xian Lu</a>, <a href="/search/quant-ph?searchtype=author&query=Cui%2C+C">Chunfeng Cui</a>, <a href="/search/quant-ph?searchtype=author&query=Wen%2C+J">Jingwei Wen</a>, <a href="/search/quant-ph?searchtype=author&query=Xu%2C+J">Jiaqi Xu</a>, <a href="/search/quant-ph?searchtype=author&query=Cao%2C+C">Chongyu Cao</a>, <a href="/search/quant-ph?searchtype=author&query=Ma%2C+Y">Yin Ma</a>, <a href="/search/quant-ph?searchtype=author&query=Wei%2C+H">Hai Wei</a>, <a href="/search/quant-ph?searchtype=author&query=Wen%2C+K">Kai Wen</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.12389v2-abstract-short" style="display: inline;"> Massive multiple-input multiple-output (MIMO) has gained widespread popularity in recent years due to its ability to increase data rates, improve signal quality, and provide better coverage in challenging environments. In this paper, we investigate the MIMO beam selection (MBS) problem, which is proven to be NP-hard and computationally intractable. To deal with this problem, quantum computing that… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.12389v2-abstract-full').style.display = 'inline'; document.getElementById('2310.12389v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.12389v2-abstract-full" style="display: none;"> Massive multiple-input multiple-output (MIMO) has gained widespread popularity in recent years due to its ability to increase data rates, improve signal quality, and provide better coverage in challenging environments. In this paper, we investigate the MIMO beam selection (MBS) problem, which is proven to be NP-hard and computationally intractable. To deal with this problem, quantum computing that can provide faster and more efficient solutions to large-scale combinatorial optimization is considered. MBS is formulated in a quadratic unbounded binary optimization form and solved with Coherent Ising Machine (CIM) physical machine. We compare the performance of our solution with two classic heuristics, simulated annealing and Tabu search. The results demonstrate an average performance improvement by a factor of 261.23 and 20.6, respectively, which shows that CIM-based solution performs significantly better in terms of selecting the optimal subset of beams. This work shows great promise for practical 5G operation and promotes the application of quantum computing in solving computationally hard problems in communication. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.12389v2-abstract-full').style.display = 'none'; document.getElementById('2310.12389v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted by IEEE Globecom 2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.02922">arXiv:2310.02922</a> <span> [<a href="https://arxiv.org/pdf/2310.02922">pdf</a>, <a href="https://arxiv.org/format/2310.02922">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Emerging Technologies">cs.ET</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s11128-023-03859-9">10.1007/s11128-023-03859-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Public verifiable measurement-only blind quantum computation based on entanglement witnesses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Liu%2C+W">Wen-Jie Liu</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+Z">Zi-Xian Li</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wen-Bo Li</a>, <a href="/search/quant-ph?searchtype=author&query=Yang%2C+Q">Qi Yang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.02922v1-abstract-short" style="display: inline;"> Recently, Sato et al. proposed an public verifiable blind quantum computation (BQC) protocol by inserting a third-party arbiter. However, it is not true public verifiable in a sense, because the arbiter is determined in advance and participates in the whole process. In this paper, a public verifiable protocol for measurement-only BQC is proposed. The fidelity between arbitrary states and the graph… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.02922v1-abstract-full').style.display = 'inline'; document.getElementById('2310.02922v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.02922v1-abstract-full" style="display: none;"> Recently, Sato et al. proposed an public verifiable blind quantum computation (BQC) protocol by inserting a third-party arbiter. However, it is not true public verifiable in a sense, because the arbiter is determined in advance and participates in the whole process. In this paper, a public verifiable protocol for measurement-only BQC is proposed. The fidelity between arbitrary states and the graph states of 2-colorable graphs is estimated by measuring the entanglement witnesses of the graph states,so as to verify the correctness of the prepared graph states. Compared with the previous protocol, our protocol is public verifiable in the true sense by allowing other random clients to execute the public verification. It also has greater advantages in the efficiency, where the number of local measurements is O(n^3*log {n}) and graph states' copies is O(n^2*log{n}). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.02922v1-abstract-full').style.display = 'none'; document.getElementById('2310.02922v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Quantum Information Processing, 2023. 22(3): p. 137 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.02585">arXiv:2310.02585</a> <span> [<a href="https://arxiv.org/pdf/2310.02585">pdf</a>, <a href="https://arxiv.org/format/2310.02585">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Localising two sub-diffraction emitters in 3D using quantum correlation microscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+S">Shuo Li</a>, <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenchao Li</a>, <a href="/search/quant-ph?searchtype=author&query=Sun%2C+Q">Qiang Sun</a>, <a href="/search/quant-ph?searchtype=author&query=Moran%2C+B">Bill Moran</a>, <a href="/search/quant-ph?searchtype=author&query=Brown%2C+T+C">Timothy C. Brown</a>, <a href="/search/quant-ph?searchtype=author&query=Gibson%2C+B+C">Brant C. Gibson</a>, <a href="/search/quant-ph?searchtype=author&query=Greentree%2C+A+D">Andrew D. Greentree</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.02585v1-abstract-short" style="display: inline;"> The localisation of fluorophores is an important aspect of the determination of the biological function of cellular systems. Quantum correlation microscopy (QCM) is a promising technique for providing diffraction unlimited emitter localisation that can be used with either confocal or widefield modalities. However, so far, QCM has not been applied to three dimensional localisation problems. Here we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.02585v1-abstract-full').style.display = 'inline'; document.getElementById('2310.02585v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.02585v1-abstract-full" style="display: none;"> The localisation of fluorophores is an important aspect of the determination of the biological function of cellular systems. Quantum correlation microscopy (QCM) is a promising technique for providing diffraction unlimited emitter localisation that can be used with either confocal or widefield modalities. However, so far, QCM has not been applied to three dimensional localisation problems. Here we show that quantum correlation microscopy provides diffraction-unlimited three-dimensional localisation for two emitters within a single diffraction-limited spot. By introducing a two-stage maximum likelihood estimator, our modelling shows that localisation precision scales as $1/\sqrt{t}$ where $t$ is the total detection time. Diffraction unlimited localisation is achieved using both intensity and photon correlation from Hanbury Brown and Twiss measurements at as few as four measurement locations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.02585v1-abstract-full').style.display = 'none'; document.getElementById('2310.02585v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.06013">arXiv:2309.06013</a> <span> [<a href="https://arxiv.org/pdf/2309.06013">pdf</a>, <a href="https://arxiv.org/ps/2309.06013">ps</a>, <a href="https://arxiv.org/format/2309.06013">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> </div> <p class="title is-5 mathjax"> High-tolerance antiblockade SWAP gates using optimal pulse drivings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wan-Xia Li</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+J">Jin-Lei Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+S">Shi-Lei Su</a>, <a href="/search/quant-ph?searchtype=author&query=Qian%2C+J">Jing Qian</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.06013v2-abstract-short" style="display: inline;"> Position error is treated as the leading obstacle that prevents Rydberg antiblockade gates from being experimentally realizable, because of the inevitable fluctuations in the relative motion between two atoms invalidating the antiblockade condition. In this work we report progress towards a high-tolerance antiblockade-based Rydberg SWAP gate enabled by the use of {\it modified} antiblockade condit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.06013v2-abstract-full').style.display = 'inline'; document.getElementById('2309.06013v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.06013v2-abstract-full" style="display: none;"> Position error is treated as the leading obstacle that prevents Rydberg antiblockade gates from being experimentally realizable, because of the inevitable fluctuations in the relative motion between two atoms invalidating the antiblockade condition. In this work we report progress towards a high-tolerance antiblockade-based Rydberg SWAP gate enabled by the use of {\it modified} antiblockade condition combined with carefully-optimized laser pulses. Depending on the optimization of diverse pulse shapes our protocol shows that the amount of time-spent in the double Rydberg state can be shortened by more than $70\%$ with respect to the case using {\it perfect} antiblockade condition, which significantly reduces this position error. Moreover, we benchmark the robustness of the gate via taking account of the technical noises, such as the Doppler dephasing due to atomic thermal motion, the fluctuations in laser intensity and laser phase and the intensity inhomogeneity. As compared to other existing antiblockade-gate schemes the predicted gate fidelity is able to maintain at above 0.91 after a very conservative estimation of various experimental imperfections, especially considered for realistic interaction deviation of $未V/V\approx 5.92\%$ at $T\sim20$ $渭$K. Our work paves the way to the experimental demonstration of Rydberg antiblockade gates in the near future. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.06013v2-abstract-full').style.display = 'none'; document.getElementById('2309.06013v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 5 figures, accepted by PRA</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.02201">arXiv:2309.02201</a> <span> [<a href="https://arxiv.org/pdf/2309.02201">pdf</a>, <a href="https://arxiv.org/format/2309.02201">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.109.045012">10.1103/PhysRevD.109.045012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Principle of minimal singularity for Green's functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Li%2C+W">Wenliang Li</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.02201v4-abstract-short" style="display: inline;"> Analytic continuations of integer-valued parameters can lead to profound insights, such as angular momentum in Regge theory, the number of replicas in spin glasses, the number of internal degrees of freedom, the spacetime dimension in dimensional regularization and Wilson's renormalization group. In this work, we consider a new kind of analytic continuation of correlation functions, inspired by tw… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.02201v4-abstract-full').style.display = 'inline'; document.getElementById('2309.02201v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.02201v4-abstract-full" style="display: none;"> Analytic continuations of integer-valued parameters can lead to profound insights, such as angular momentum in Regge theory, the number of replicas in spin glasses, the number of internal degrees of freedom, the spacetime dimension in dimensional regularization and Wilson's renormalization group. In this work, we consider a new kind of analytic continuation of correlation functions, inspired by two recent approaches to underdetermined Dyson-Schwinger equations in $D$-dimensional spacetime. If the Green's functions $G_n=\langle蠁^n\rangle$ admit analytic continuation to complex values of $n$, the two different approaches are unified by a novel principle for self-consistent problems: Singularities in the complex plane should be minimal. This principle manifests as the merging of different branches of Green's functions in the quartic theories. For $D=0$, we obtain the closed-form solutions of the general $g蠁^m$ theories, including the cases with complex coupling constant $g$ or non-integer power $m$. For $D=1$, we derive rapidly convergent results for the Hermitian quartic and non-Hermitian cubic theories by minimizing the complexity of the singularity at $n=\infty$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.02201v4-abstract-full').style.display = 'none'; document.getElementById('2309.02201v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">v4: 9 pages, 4 figures, typos corrected, discussion improved, references added; v3: appendix added about the merging phenomenon in the quartic matrix model; v2: more details added about the application to the 1D non-Hermitian cubic theory</span> </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Li%2C+W&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> <li> <a href="/search/?searchtype=author&query=Li%2C+W&start=150" class="pagination-link " aria-label="Page 4" aria-current="page">4 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