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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2409.03482">arXiv:2409.03482</a> <span> [<a href="https://arxiv.org/pdf/2409.03482">pdf</a>, <a href="https://arxiv.org/format/2409.03482">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"> Generating arbitrary superpositions of nonclassical quantum harmonic oscillator states </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Saner%2C+S">S. Saner</a>, <a href="/search/quant-ph?searchtype=author&query=B%C4%83z%C4%83van%2C+O">O. B膬z膬van</a>, <a href="/search/quant-ph?searchtype=author&query=Webb%2C+D+J">D. J. Webb</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</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="2409.03482v1-abstract-short" style="display: inline;"> Full coherent control and generation of superpositions of the quantum harmonic oscillator are not only of fundamental interest but are crucial for applications in quantum simulations, quantum-enhanced metrology and continuous-variable quantum computation. The extension of such superpositions to nonclassical states increases their power as a resource for such applications. Here, we create arbitrary… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.03482v1-abstract-full').style.display = 'inline'; document.getElementById('2409.03482v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.03482v1-abstract-full" style="display: none;"> Full coherent control and generation of superpositions of the quantum harmonic oscillator are not only of fundamental interest but are crucial for applications in quantum simulations, quantum-enhanced metrology and continuous-variable quantum computation. The extension of such superpositions to nonclassical states increases their power as a resource for such applications. Here, we create arbitrary superpositions of nonclassical and non-Gaussian states of a quantum harmonic oscillator using the motion of a trapped ion coupled to its internal spin states. We interleave spin-dependent nonlinear bosonic interactions and mid-circuit measurements of the spin that preserve the coherence of the oscillator. These techniques enable the creation of superpositions between squeezed, trisqueezed, and quadsqueezed states, which have never been demonstrated before, with independent control over the complex-valued squeezing parameter and the probability amplitude of each constituent, as well as their spatial separation. We directly observe the nonclassical nature of these states in the form of Wigner negativity following a full state reconstruction. Our methods apply to any system where a quantum harmonic oscillator is coupled to a spin. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.03482v1-abstract-full').style.display = 'none'; document.getElementById('2409.03482v1-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">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/2408.00149">arXiv:2408.00149</a> <span> [<a href="https://arxiv.org/pdf/2408.00149">pdf</a>, <a href="https://arxiv.org/format/2408.00149">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"> Multipartite Entanglement for Multi-node Quantum Networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Agrawal%2C+A">A. Agrawal</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</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="2408.00149v1-abstract-short" style="display: inline;"> Scaling the number of entangled nodes in a quantum network is a challenge with significant implications for quantum computing, clock synchronisation, secure communications, and quantum sensing. In a quantum network, photons interact with matter qubits at different nodes, flexibly enabling the creation of remote entanglement between them. Multipartite entanglement among multiple nodes will be cruci… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.00149v1-abstract-full').style.display = 'inline'; document.getElementById('2408.00149v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.00149v1-abstract-full" style="display: none;"> Scaling the number of entangled nodes in a quantum network is a challenge with significant implications for quantum computing, clock synchronisation, secure communications, and quantum sensing. In a quantum network, photons interact with matter qubits at different nodes, flexibly enabling the creation of remote entanglement between them. Multipartite entanglement among multiple nodes will be crucial for many proposed quantum network applications, including quantum computational tasks and quantum metrology. To date, experimental efforts have primarily focused on generating bipartite entanglement between nodes, which is widely regarded as the fundamental quantum resource for quantum networks. However, relying exclusively on bipartite entanglement to form more complex multipartite entanglement introduces several challenges. These include the need for ancillary qubits, extensive local entangling operations which increases the preparation latency, and increasingly stringent requirements on coherence times as the number of nodes grows. Here, we analyse various schemes that achieve multipartite entanglement between nodes in a single step, bypassing the need for multiple rounds of bipartite entanglement. We demonstrate that different schemes can produce distinct multipartite entangled states, with varying fidelity and generation rates. Additionally, we discuss the applicability of these schemes across different experimental platforms, highlighting their primary advantages and disadvantages. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.00149v1-abstract-full').style.display = 'none'; document.getElementById('2408.00149v1-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 July, 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/2407.07694">arXiv:2407.07694</a> <span> [<a href="https://arxiv.org/pdf/2407.07694">pdf</a>, <a href="https://arxiv.org/format/2407.07694">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"> Scalable, high-fidelity all-electronic control of trapped-ion qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=L%C3%B6schnauer%2C+C+M">C. M. L枚schnauer</a>, <a href="/search/quant-ph?searchtype=author&query=Toba%2C+J+M">J. Mosca Toba</a>, <a href="/search/quant-ph?searchtype=author&query=Hughes%2C+A+C">A. C. Hughes</a>, <a href="/search/quant-ph?searchtype=author&query=King%2C+S+A">S. A. King</a>, <a href="/search/quant-ph?searchtype=author&query=Weber%2C+M+A">M. A. Weber</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Matt%2C+R">R. Matt</a>, <a href="/search/quant-ph?searchtype=author&query=Nourshargh%2C+R">R. Nourshargh</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Matthiesen%2C+C">C. Matthiesen</a>, <a href="/search/quant-ph?searchtype=author&query=Malinowski%2C+M">M. Malinowski</a>, <a href="/search/quant-ph?searchtype=author&query=Harty%2C+T+P">T. P. Harty</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="2407.07694v1-abstract-short" style="display: inline;"> The central challenge of quantum computing is implementing high-fidelity quantum gates at scale. However, many existing approaches to qubit control suffer from a scale-performance trade-off, impeding progress towards the creation of useful devices. Here, we present a vision for an electronically controlled trapped-ion quantum computer that alleviates this bottleneck. Our architecture utilizes shar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.07694v1-abstract-full').style.display = 'inline'; document.getElementById('2407.07694v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.07694v1-abstract-full" style="display: none;"> The central challenge of quantum computing is implementing high-fidelity quantum gates at scale. However, many existing approaches to qubit control suffer from a scale-performance trade-off, impeding progress towards the creation of useful devices. Here, we present a vision for an electronically controlled trapped-ion quantum computer that alleviates this bottleneck. Our architecture utilizes shared current-carrying traces and local tuning electrodes in a microfabricated chip to perform quantum gates with low noise and crosstalk regardless of device size. To verify our approach, we experimentally demonstrate low-noise site-selective single- and two-qubit gates in a seven-zone ion trap that can control up to 10 qubits. We implement electronic single-qubit gates with 99.99916(7)% fidelity, and demonstrate consistent performance with low crosstalk across the device. We also electronically generate two-qubit maximally entangled states with 99.97(1)% fidelity and long-term stable performance over continuous system operation. These state-of-the-art results validate the path to directly scaling these techniques to large-scale quantum computers based on electronically controlled trapped-ion qubits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.07694v1-abstract-full').style.display = 'none'; document.getElementById('2407.07694v1-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 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/2407.00835">arXiv:2407.00835</a> <span> [<a href="https://arxiv.org/pdf/2407.00835">pdf</a>, <a href="https://arxiv.org/format/2407.00835">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/s41586-024-08404-x">10.1038/s41586-024-08404-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Distributed Quantum Computing across an Optical Network Link </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Agrawal%2C+A">A. Agrawal</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2407.00835v1-abstract-short" style="display: inline;"> Distributed quantum computing (DQC) combines the computing power of multiple networked quantum processing modules, enabling the execution of large quantum circuits without compromising on performance and connectivity. Photonic networks are well-suited as a versatile and reconfigurable interconnect layer for DQC; remote entanglement shared between matter qubits across the network enables all-to-all… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.00835v1-abstract-full').style.display = 'inline'; document.getElementById('2407.00835v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.00835v1-abstract-full" style="display: none;"> Distributed quantum computing (DQC) combines the computing power of multiple networked quantum processing modules, enabling the execution of large quantum circuits without compromising on performance and connectivity. Photonic networks are well-suited as a versatile and reconfigurable interconnect layer for DQC; remote entanglement shared between matter qubits across the network enables all-to-all logical connectivity via quantum gate teleportation (QGT). For a scalable DQC architecture, the QGT implementation must be deterministic and repeatable; until now, there has been no demonstration satisfying these requirements. We experimentally demonstrate the distribution of quantum computations between two photonically interconnected trapped-ion modules. The modules are separated by $\sim$ 2 m, and each contains dedicated network and circuit qubits. By using heralded remote entanglement between the network qubits, we deterministically teleport a controlled-Z gate between two circuit qubits in separate modules, achieving 86% fidelity. We then execute Grover's search algorithm - the first implementation of a distributed quantum algorithm comprising multiple non-local two-qubit gates - and measure a 71% success rate. Furthermore, we implement distributed iSWAP and SWAP circuits, compiled with 2 and 3 instances of QGT, respectively, demonstrating the ability to distribute arbitrary two-qubit operations. As photons can be interfaced with a variety of systems, this technique has applications extending beyond trapped-ion quantum computers, providing a viable pathway towards large-scale quantum computing for a range of physical platforms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.00835v1-abstract-full').style.display = 'none'; document.getElementById('2407.00835v1-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> 30 June, 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">16 pages, 7 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.08412">arXiv:2406.08412</a> <span> [<a href="https://arxiv.org/pdf/2406.08412">pdf</a>, <a href="https://arxiv.org/format/2406.08412">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"> Experimental Quantum Advantage in the Odd-Cycle Game </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Agrawal%2C+A">A. Agrawal</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Cabello%2C+A">A. Cabello</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2406.08412v2-abstract-short" style="display: inline;"> We report the first experimental demonstration of the odd-cycle game. We entangle two ions separated by ~2 m and the players use them to win the odd-cycle game with a probability ~26 sigma above that allowed by the best classical strategy. The experiment implements the optimal quantum strategy, is free of loopholes, and achieves 97.8(3) % of the theoretical limit to the quantum winning probability… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.08412v2-abstract-full').style.display = 'inline'; document.getElementById('2406.08412v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.08412v2-abstract-full" style="display: none;"> We report the first experimental demonstration of the odd-cycle game. We entangle two ions separated by ~2 m and the players use them to win the odd-cycle game with a probability ~26 sigma above that allowed by the best classical strategy. The experiment implements the optimal quantum strategy, is free of loopholes, and achieves 97.8(3) % of the theoretical limit to the quantum winning probability. We perform the associated Bell test and measure a nonlocal content of 0.54(2) -- the largest value for physically separate devices, free of the detection loophole, ever observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.08412v2-abstract-full').style.display = 'none'; document.getElementById('2406.08412v2-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.05471">arXiv:2403.05471</a> <span> [<a href="https://arxiv.org/pdf/2403.05471">pdf</a>, <a href="https://arxiv.org/format/2403.05471">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"> Squeezing, trisqueezing, and quadsqueezing in a spin-oscillator system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=B%C4%83z%C4%83van%2C+O">O. B膬z膬van</a>, <a href="/search/quant-ph?searchtype=author&query=Saner%2C+S">S. Saner</a>, <a href="/search/quant-ph?searchtype=author&query=Webb%2C+D+J">D. J. Webb</a>, <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</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="2403.05471v1-abstract-short" style="display: inline;"> Quantum harmonic oscillators model a wide variety of phenomena ranging from electromagnetic fields to vibrations of atoms in molecules. Their excitations can be represented by bosons such as photons, single particles of light, or phonons, the quanta of vibrational energy. Linear interactions that only create and annihilate single bosons can generate coherent states of light or motion. Introducing… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05471v1-abstract-full').style.display = 'inline'; document.getElementById('2403.05471v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.05471v1-abstract-full" style="display: none;"> Quantum harmonic oscillators model a wide variety of phenomena ranging from electromagnetic fields to vibrations of atoms in molecules. Their excitations can be represented by bosons such as photons, single particles of light, or phonons, the quanta of vibrational energy. Linear interactions that only create and annihilate single bosons can generate coherent states of light or motion. Introducing nth-order nonlinear interactions, that instead involve n bosons, leads to increasingly complex quantum behaviour. For example, second-order interactions enable squeezing, used to enhance the precision of measurements beyond classical limits, while higher-order interactions create non-Gaussian states essential for continuous-variable quantum computation. However, generating nonlinear interactions is challenging, typically requiring higher-order derivatives of the driving field or specialized hardware. Hybrid systems, where linear interactions couple an oscillator to an additional spin, offer a solution and are readily available across many platforms. Here, using the spin of a single trapped ion coupled to its motion, we employ two linear interactions to demonstrate up to fourth-order bosonic interactions; we focus on generalised squeezing interactions and demonstrate squeezing, trisqueezing, and quadsqueezing. We characterise these interactions, including their spin dependence, and reconstruct the Wigner function of the resulting states. We also discuss the scaling of the interaction strength, where we drive the quadsqueezing interaction more than 100 times faster than using conventional techniques. Our method presents no fundamental limit in the interaction order n and applies to any platform supporting spin-dependent linear interactions. Strong higher-order nonlinear interactions unlock the study of fundamental quantum optics, quantum simulation, and computation in a hitherto unexplored regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05471v1-abstract-full').style.display = 'none'; document.getElementById('2403.05471v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.08700">arXiv:2305.08700</a> <span> [<a href="https://arxiv.org/pdf/2305.08700">pdf</a>, <a href="https://arxiv.org/format/2305.08700">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="High Energy Physics - Lattice">hep-lat</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/s42005-024-01691-w">10.1038/s42005-024-01691-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Synthetic $\mathbb{Z}_2$ gauge theories based on parametric excitations of trapped ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=B%C4%83z%C4%83van%2C+O">O. B膬z膬van</a>, <a href="/search/quant-ph?searchtype=author&query=Saner%2C+S">S. Saner</a>, <a href="/search/quant-ph?searchtype=author&query=Tirrito%2C+E">E. Tirrito</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Bermudez%2C+A">A. Bermudez</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="2305.08700v3-abstract-short" style="display: inline;"> We present a detailed scheme for the analog quantum simulation of $\mathbb{Z}_2$ gauge theories in crystals of trapped ions, which exploits a more efficient hybrid encoding of the gauge and matter fields using the native internal and motional degrees of freedom. We introduce a versatile toolbox based on parametric excitations corresponding to different spin-motion-coupling schemes that induce a tu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.08700v3-abstract-full').style.display = 'inline'; document.getElementById('2305.08700v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.08700v3-abstract-full" style="display: none;"> We present a detailed scheme for the analog quantum simulation of $\mathbb{Z}_2$ gauge theories in crystals of trapped ions, which exploits a more efficient hybrid encoding of the gauge and matter fields using the native internal and motional degrees of freedom. We introduce a versatile toolbox based on parametric excitations corresponding to different spin-motion-coupling schemes that induce a tunneling of the ions vibrational excitations conditioned to their internal qubit state. This building block, when implemented with a single trapped ion, corresponds to a minimal $\mathbb{Z}_2$ gauge theory, where the qubit plays the role of the gauge field on a synthetic link, and the vibrational excitations along different trap axes mimic the dynamical matter fields two synthetic sites, each carrying a $\mathbb{Z}_2$ charge. To evaluate their feasibility, we perform numerical simulations of the state-dependent tunneling using realistic parameters, and identify the leading sources of error in future experiments. We discuss how to generalise this minimal case to more complex settings by increasing the number of ions, moving from a single link to a $\mathbb{Z}_2$ plaquette, and to an entire $\mathbb{Z}_2$ chain. We present analytical expressions for the gauge-invariant dynamics and the corresponding confinement, which are benchmarked using matrix product state simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.08700v3-abstract-full').style.display = 'none'; document.getElementById('2305.08700v3-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">24 pages(main text), 31 figures, 3 appendixes, closer to the published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Commun Phys 7, 229 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.03450">arXiv:2305.03450</a> <span> [<a href="https://arxiv.org/pdf/2305.03450">pdf</a>, <a href="https://arxiv.org/format/2305.03450">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/PhysRevLett.131.220601">10.1103/PhysRevLett.131.220601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Saner%2C+S">S. Saner</a>, <a href="/search/quant-ph?searchtype=author&query=B%C4%83z%C4%83van%2C+O">O. B膬z膬van</a>, <a href="/search/quant-ph?searchtype=author&query=Minder%2C+M">M. Minder</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Webb%2C+D+J">D. J. Webb</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</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="2305.03450v2-abstract-short" style="display: inline;"> All laser-driven entangling operations for trapped-ion qubits have hitherto been performed without control of the optical phase of the light field, which precludes independent tuning of the carrier and motional coupling. By placing $^{88}$Sr$^+$ ions in a $位=674$ nm standing wave, whose relative position is controlled to $\approx位/100$, we suppress the carrier coupling by a factor of $18$, while c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.03450v2-abstract-full').style.display = 'inline'; document.getElementById('2305.03450v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.03450v2-abstract-full" style="display: none;"> All laser-driven entangling operations for trapped-ion qubits have hitherto been performed without control of the optical phase of the light field, which precludes independent tuning of the carrier and motional coupling. By placing $^{88}$Sr$^+$ ions in a $位=674$ nm standing wave, whose relative position is controlled to $\approx位/100$, we suppress the carrier coupling by a factor of $18$, while coherently enhancing the spin-motion coupling. We experimentally demonstrate that the off-resonant carrier coupling imposes a speed limit for conventional traveling-wave M酶lmer-S酶rensen gates; we use the standing wave to surpass this limit and achieve a gate duration of $15\ 渭$s, restricted by the available laser power. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.03450v2-abstract-full').style.display = 'none'; document.getElementById('2305.03450v2-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">S. Saner and O. B膬z膬van contributed equally to this work</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.02936">arXiv:2305.02936</a> <span> [<a href="https://arxiv.org/pdf/2305.02936">pdf</a>, <a href="https://arxiv.org/format/2305.02936">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/PhysRevLett.132.150604">10.1103/PhysRevLett.132.150604 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Verifiable blind quantum computing with trapped ions and single photons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Leichtle%2C+D">D. Leichtle</a>, <a href="/search/quant-ph?searchtype=author&query=Mantri%2C+A">A. Mantri</a>, <a href="/search/quant-ph?searchtype=author&query=Kashefi%2C+E">E. Kashefi</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2305.02936v3-abstract-short" style="display: inline;"> We report the first hybrid matter-photon implementation of verifiable blind quantum computing. We use a trapped-ion quantum server and a client-side photonic detection system networked via a fibre-optic quantum link. The availability of memory qubits and deterministic entangling gates enables interactive protocols without post-selection - key requirements for any scalable blind server, which previ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.02936v3-abstract-full').style.display = 'inline'; document.getElementById('2305.02936v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.02936v3-abstract-full" style="display: none;"> We report the first hybrid matter-photon implementation of verifiable blind quantum computing. We use a trapped-ion quantum server and a client-side photonic detection system networked via a fibre-optic quantum link. The availability of memory qubits and deterministic entangling gates enables interactive protocols without post-selection - key requirements for any scalable blind server, which previous realisations could not provide. We quantify the privacy at <~0.03 leaked classical bits per qubit. This experiment demonstrates a path to fully verified quantum computing in the cloud. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.02936v3-abstract-full').style.display = 'none'; document.getElementById('2305.02936v3-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 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.05529">arXiv:2304.05529</a> <span> [<a href="https://arxiv.org/pdf/2304.05529">pdf</a>, <a href="https://arxiv.org/ps/2304.05529">ps</a>, <a href="https://arxiv.org/format/2304.05529">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/PRXQuantum.5.020314">10.1103/PRXQuantum.5.020314 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental speedup of quantum dynamics through squeezing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Knaack%2C+H+M">H. M. Knaack</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Arenz%2C+C">C. Arenz</a>, <a href="/search/quant-ph?searchtype=author&query=Collopy%2C+A+L">A. L. Collopy</a>, <a href="/search/quant-ph?searchtype=author&query=Stephenson%2C+L+J">L. J. Stephenson</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Bollinger%2C+J+J">J. J. Bollinger</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</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="2304.05529v1-abstract-short" style="display: inline;"> We show experimentally that a broad class of interactions involving quantum harmonic oscillators can be made stronger (amplified) using a unitary squeezing protocol. While our demonstration uses the motional and spin states of a single trapped $^{25}$Mg$^{+}$ ion, the scheme applies generally to Hamiltonians involving just a single harmonic oscillator as well as Hamiltonians coupling the oscillato… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.05529v1-abstract-full').style.display = 'inline'; document.getElementById('2304.05529v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.05529v1-abstract-full" style="display: none;"> We show experimentally that a broad class of interactions involving quantum harmonic oscillators can be made stronger (amplified) using a unitary squeezing protocol. While our demonstration uses the motional and spin states of a single trapped $^{25}$Mg$^{+}$ ion, the scheme applies generally to Hamiltonians involving just a single harmonic oscillator as well as Hamiltonians coupling the oscillator to another quantum degree of freedom such as a qubit, covering a large range of systems of interest in quantum information and metrology applications. Importantly, the protocol does not require knowledge of the parameters of the Hamiltonian to be amplified, nor does it require a well-defined phase relationship between the squeezing interaction and the rest of the system dynamics, making it potentially useful in instances where certain aspects of a signal or interaction may be unknown or uncontrolled. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.05529v1-abstract-full').style.display = 'none'; document.getElementById('2304.05529v1-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> 11 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16129">arXiv:2210.16129</a> <span> [<a href="https://arxiv.org/pdf/2210.16129">pdf</a>, <a href="https://arxiv.org/format/2210.16129">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/PhysRevLett.131.020601">10.1103/PhysRevLett.131.020601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coherent Control of Trapped Ion Qubits with Localized Electric Fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=L%C3%B6schnauer%2C+C+M">C. M. L枚schnauer</a>, <a href="/search/quant-ph?searchtype=author&query=Malinowski%2C+M">M. Malinowski</a>, <a href="/search/quant-ph?searchtype=author&query=Hughes%2C+A+C">A. C. Hughes</a>, <a href="/search/quant-ph?searchtype=author&query=Nourshargh%2C+R">R. Nourshargh</a>, <a href="/search/quant-ph?searchtype=author&query=Negnevitsky%2C+V">V. Negnevitsky</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=King%2C+S+A">S. A. King</a>, <a href="/search/quant-ph?searchtype=author&query=Matthiesen%2C+C">C. Matthiesen</a>, <a href="/search/quant-ph?searchtype=author&query=Harty%2C+T+P">T. P. Harty</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</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="2210.16129v1-abstract-short" style="display: inline;"> We present a new method for coherent control of trapped ion qubits in separate interaction regions of a multi-zone trap by simultaneously applying an electric field and a spin-dependent gradient. Both the phase and amplitude of the effective single-qubit rotation depend on the electric field, which can be localised to each zone. We demonstrate this interaction on a single ion using both laser-base… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16129v1-abstract-full').style.display = 'inline'; document.getElementById('2210.16129v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16129v1-abstract-full" style="display: none;"> We present a new method for coherent control of trapped ion qubits in separate interaction regions of a multi-zone trap by simultaneously applying an electric field and a spin-dependent gradient. Both the phase and amplitude of the effective single-qubit rotation depend on the electric field, which can be localised to each zone. We demonstrate this interaction on a single ion using both laser-based and magnetic field gradients in a surface-electrode ion trap, and measure the localisation of the electric field. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16129v1-abstract-full').style.display = 'none'; document.getElementById('2210.16129v1-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, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.11447">arXiv:2210.11447</a> <span> [<a href="https://arxiv.org/pdf/2210.11447">pdf</a>, <a href="https://arxiv.org/format/2210.11447">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/PhysRevLett.130.090803">10.1103/PhysRevLett.130.090803 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Robust Quantum Memory in a Trapped-Ion Quantum Network Node </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Weber%2C+M+A">M. A. Weber</a>, <a href="/search/quant-ph?searchtype=author&query=Ainley%2C+E+M">E. M. Ainley</a>, <a href="/search/quant-ph?searchtype=author&query=Agrawal%2C+A">A. Agrawal</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2210.11447v2-abstract-short" style="display: inline;"> We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in Sr-88 is transferred to Ca-43 with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with a second photon, without affecting the memory qubit. We perform quantum state tomography to show that the fidel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.11447v2-abstract-full').style.display = 'inline'; document.getElementById('2210.11447v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.11447v2-abstract-full" style="display: none;"> We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in Sr-88 is transferred to Ca-43 with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with a second photon, without affecting the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ~70 times slower on the memory qubit. Dynamical decoupling further extends the storage duration; we measure an ion-photon entanglement fidelity of 0.81(4) after 10s. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.11447v2-abstract-full').style.display = 'none'; document.getElementById('2210.11447v2-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 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.11193">arXiv:2207.11193</a> <span> [<a href="https://arxiv.org/pdf/2207.11193">pdf</a>, <a href="https://arxiv.org/format/2207.11193">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/PhysRevA.107.022617">10.1103/PhysRevA.107.022617 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Synthesizing a $\hat蟽_z$ spin-dependent force for optical, metastable, and ground state trapped-ion qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=B%C4%83z%C4%83van%2C+O">O. B膬z膬van</a>, <a href="/search/quant-ph?searchtype=author&query=Saner%2C+S">S. Saner</a>, <a href="/search/quant-ph?searchtype=author&query=Minder%2C+M">M. Minder</a>, <a href="/search/quant-ph?searchtype=author&query=Hughes%2C+A+C">A. C. Hughes</a>, <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</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="2207.11193v2-abstract-short" style="display: inline;"> A single bichromatic field near-resonant to a qubit transition is typically used for $\hat蟽_x$ or $\hat蟽_y$ M酶lmer-S酶rensen type interactions in trapped ion systems. Using this field configuration, it is also possible to synthesize a $\hat蟽_z$ spin-dependent force by merely adjusting the beat-note frequency. Here, we expand on previous work and present a comprehensive theoretical and experimental… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.11193v2-abstract-full').style.display = 'inline'; document.getElementById('2207.11193v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.11193v2-abstract-full" style="display: none;"> A single bichromatic field near-resonant to a qubit transition is typically used for $\hat蟽_x$ or $\hat蟽_y$ M酶lmer-S酶rensen type interactions in trapped ion systems. Using this field configuration, it is also possible to synthesize a $\hat蟽_z$ spin-dependent force by merely adjusting the beat-note frequency. Here, we expand on previous work and present a comprehensive theoretical and experimental investigation of this scheme with a laser near-resonant to a quadrupole transition in $^{88}$Sr$^+$. Further, we characterise its robustness to optical phase and qubit frequency offsets, and demonstrate its versatility by entangling optical, metastable, and ground state qubits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.11193v2-abstract-full').style.display = 'none'; document.getElementById('2207.11193v2-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 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </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">O. B膬z膬van and S. Saner contributed equally to this work</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.06546">arXiv:2206.06546</a> <span> [<a href="https://arxiv.org/pdf/2206.06546">pdf</a>, <a href="https://arxiv.org/format/2206.06546">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/PhysRevA.107.032604">10.1103/PhysRevA.107.032604 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Individual addressing of trapped ion qubits with geometric phase gates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</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="2206.06546v1-abstract-short" style="display: inline;"> We propose a new scheme for individual addressing of trapped ion qubits, selecting them via their motional frequency. We show that geometric phase gates can perform single-qubit rotations using the coherent interference of spin-independent and (global) spin-dependent forces. The spin-independent forces, which can be generated via localised electric fields, increase the gate speed while reducing it… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.06546v1-abstract-full').style.display = 'inline'; document.getElementById('2206.06546v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.06546v1-abstract-full" style="display: none;"> We propose a new scheme for individual addressing of trapped ion qubits, selecting them via their motional frequency. We show that geometric phase gates can perform single-qubit rotations using the coherent interference of spin-independent and (global) spin-dependent forces. The spin-independent forces, which can be generated via localised electric fields, increase the gate speed while reducing its sensitivity to motional decoherence, which we show analytically and numerically. While the scheme applies to most trapped ion experimental setups, we numerically simulate a specific laser-free implementation, showing cross-talk errors below $10^{-6}$ for reasonable parameters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.06546v1-abstract-full').style.display = 'none'; document.getElementById('2206.06546v1-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 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 107, 032604 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.10336">arXiv:2111.10336</a> <span> [<a href="https://arxiv.org/pdf/2111.10336">pdf</a>, <a href="https://arxiv.org/format/2111.10336">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/10.1038/s41586-022-05088-z">10.1038/s41586-022-05088-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A quantum network of entangled optical atomic clocks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2111.10336v1-abstract-short" style="display: inline;"> Optical atomic clocks are our most precise tools to measure time and frequency. They enable precision frequency comparisons between atoms in separate locations to probe the space-time variation of fundamental constants, the properties of dark matter, and for geodesy. Measurements on independent systems are limited by the standard quantum limit (SQL); measurements on entangled systems, in contrast,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.10336v1-abstract-full').style.display = 'inline'; document.getElementById('2111.10336v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.10336v1-abstract-full" style="display: none;"> Optical atomic clocks are our most precise tools to measure time and frequency. They enable precision frequency comparisons between atoms in separate locations to probe the space-time variation of fundamental constants, the properties of dark matter, and for geodesy. Measurements on independent systems are limited by the standard quantum limit (SQL); measurements on entangled systems, in contrast, can surpass the SQL to reach the ultimate precision allowed by quantum theory - the so-called Heisenberg limit. While local entangling operations have been used to demonstrate this enhancement at microscopic distances, frequency comparisons between remote atomic clocks require rapid high-fidelity entanglement between separate systems that have no intrinsic interactions. We demonstrate the first quantum network of entangled optical clocks using two $^{88}$Sr$^+$ ions separated by a macroscopic distance (2 m), that are entangled using a photonic link. We characterise the entanglement enhancement for frequency comparisons between the ions. We find that entanglement reduces the measurement uncertainty by a factor close to $\sqrt{2}$, as predicted for the Heisenberg limit, thus halving the number of measurements required to reach a given precision. Practically, today's optical clocks are typically limited by laser dephasing; in this regime, we find that using entangled clocks confers an even greater benefit, yielding a factor 4 reduction in the number of measurements compared to conventional correlation spectroscopy techniques. As a proof of principle, we demonstrate this enhancement for measuring a frequency shift applied to one of the clocks. Our results show that quantum networks have now attained sufficient maturity for enhanced metrology. This two-node network could be extended to additional nodes, to other species of trapped particles, or to larger entangled systems via local operations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.10336v1-abstract-full').style.display = 'none'; document.getElementById('2111.10336v1-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.14600">arXiv:2109.14600</a> <span> [<a href="https://arxiv.org/pdf/2109.14600">pdf</a>, <a href="https://arxiv.org/format/2109.14600">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> </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/s41586-022-04941-5">10.1038/s41586-022-04941-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental quantum key distribution certified by Bell's theorem </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Ivanov%2C+K">K. Ivanov</a>, <a href="/search/quant-ph?searchtype=author&query=Tan%2C+E+Y">E. Y-Z. Tan</a>, <a href="/search/quant-ph?searchtype=author&query=Sekatski%2C+P">P. Sekatski</a>, <a href="/search/quant-ph?searchtype=author&query=Urbanke%2C+R+L">R. L. Urbanke</a>, <a href="/search/quant-ph?searchtype=author&query=Renner%2C+R">R. Renner</a>, <a href="/search/quant-ph?searchtype=author&query=Sangouard%2C+N">N. Sangouard</a>, <a href="/search/quant-ph?searchtype=author&query=Bancal%2C+J">J-D. Bancal</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="2109.14600v2-abstract-short" style="display: inline;"> Cryptographic key exchange protocols traditionally rely on computational conjectures such as the hardness of prime factorisation to provide security against eavesdropping attacks. Remarkably, quantum key distribution protocols like the one proposed by Bennett and Brassard provide information-theoretic security against such attacks, a much stronger form of security unreachable by classical means. H… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14600v2-abstract-full').style.display = 'inline'; document.getElementById('2109.14600v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.14600v2-abstract-full" style="display: none;"> Cryptographic key exchange protocols traditionally rely on computational conjectures such as the hardness of prime factorisation to provide security against eavesdropping attacks. Remarkably, quantum key distribution protocols like the one proposed by Bennett and Brassard provide information-theoretic security against such attacks, a much stronger form of security unreachable by classical means. However, quantum protocols realised so far are subject to a new class of attacks exploiting implementation defects in the physical devices involved, as demonstrated in numerous ingenious experiments. Following the pioneering work of Ekert proposing the use of entanglement to bound an adversary's information from Bell's theorem, we present here the experimental realisation of a complete quantum key distribution protocol immune to these vulnerabilities. We achieve this by combining theoretical developments on finite-statistics analysis, error correction, and privacy amplification, with an event-ready scheme enabling the rapid generation of high-fidelity entanglement between two trapped-ion qubits connected by an optical fibre link. The secrecy of our key is guaranteed device-independently: it is based on the validity of quantum theory, and certified by measurement statistics observed during the experiment. Our result shows that provably secure cryptography with real-world devices is possible, and paves the way for further quantum information applications based on the device-independence principle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14600v2-abstract-full').style.display = 'none'; document.getElementById('2109.14600v2-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </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+1 pages in main text and methods with 4 figures and 1 table; 42 pages of supplementary material (replaced with revision accepted for publication in Nature; original title: "Device-Independent Quantum Key Distribution")</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 607, 682-686 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.00056">arXiv:2107.00056</a> <span> [<a href="https://arxiv.org/pdf/2107.00056">pdf</a>, <a href="https://arxiv.org/format/2107.00056">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> <p class="title is-5 mathjax"> Micromotion minimisation by synchronous detection of parametrically excited motion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Nadlinger%2C+D+P">D. P. Nadlinger</a>, <a href="/search/quant-ph?searchtype=author&query=Drmota%2C+P">P. Drmota</a>, <a href="/search/quant-ph?searchtype=author&query=Main%2C+D">D. Main</a>, <a href="/search/quant-ph?searchtype=author&query=Nichol%2C+B+C">B. C. Nichol</a>, <a href="/search/quant-ph?searchtype=author&query=Araneda%2C+G">G. Araneda</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Stephenson%2C+L+J">L. J. Stephenson</a>, <a href="/search/quant-ph?searchtype=author&query=Ballance%2C+C+J">C. J. Ballance</a>, <a href="/search/quant-ph?searchtype=author&query=Lucas%2C+D+M">D. M. Lucas</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="2107.00056v1-abstract-short" style="display: inline;"> Precise control of charged particles in radio-frequency (Paul) traps requires minimising excess micromotion induced by stray electric fields. We present a method to detect and compensate such fields through amplitude modulation of the radio-frequency trapping field. Modulation at frequencies close to the motional modes of the trapped particle excites coherent motion whose amplitude linearly depend… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00056v1-abstract-full').style.display = 'inline'; document.getElementById('2107.00056v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.00056v1-abstract-full" style="display: none;"> Precise control of charged particles in radio-frequency (Paul) traps requires minimising excess micromotion induced by stray electric fields. We present a method to detect and compensate such fields through amplitude modulation of the radio-frequency trapping field. Modulation at frequencies close to the motional modes of the trapped particle excites coherent motion whose amplitude linearly depends on the stray field. In trapped-ion experiments, this motion can be detected by recording the arrival times of photons scattered during laser cooling. Only a single laser beam is required to resolve fields in multiple directions. In a demonstration using a $^{88}\mathrm{Sr}^{+}$ ion in a surface electrode trap, we achieve a sensitivity of $0.1\, \mathrm{V}\, \mathrm{m}^{-1}\, /\, \sqrt{\mathrm{Hz}}$ and a minimal uncertainty of $0.015\, \mathrm{V}\, \mathrm{m}^{-1}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.00056v1-abstract-full').style.display = 'none'; document.getElementById('2107.00056v1-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> 30 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </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 (+appendix of 5 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/2105.05768">arXiv:2105.05768</a> <span> [<a href="https://arxiv.org/pdf/2105.05768">pdf</a>, <a href="https://arxiv.org/format/2105.05768">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/PhysRevA.104.032609">10.1103/PhysRevA.104.032609 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Universal hybrid quantum computing in trapped ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</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="2105.05768v1-abstract-short" style="display: inline;"> Using discrete and continuous variable subsystems, hybrid approaches to quantum information could enable more quantum computational power for the same physical resources. Here, we propose a hybrid scheme that can be used to generate the necessary Gaussian and non-Gaussian operations for universal continuous variable quantum computing in trapped ions. This scheme utilizes two linear spin-motion int… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.05768v1-abstract-full').style.display = 'inline'; document.getElementById('2105.05768v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.05768v1-abstract-full" style="display: none;"> Using discrete and continuous variable subsystems, hybrid approaches to quantum information could enable more quantum computational power for the same physical resources. Here, we propose a hybrid scheme that can be used to generate the necessary Gaussian and non-Gaussian operations for universal continuous variable quantum computing in trapped ions. This scheme utilizes two linear spin-motion interactions to generate a broad set of non-linear effective spin-motion interactions including one and two mode squeezing, beam splitter, and trisqueezing operations in trapped ion systems. We discuss possible experimental implementations using laser-based and laser-free approaches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.05768v1-abstract-full').style.display = 'none'; document.getElementById('2105.05768v1-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 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 104, 032609 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.12533">arXiv:2102.12533</a> <span> [<a href="https://arxiv.org/pdf/2102.12533">pdf</a>, <a href="https://arxiv.org/format/2102.12533">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/10.1038/s41586-021-03809-4">10.1038/s41586-021-03809-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-fidelity laser-free universal control of two trapped ion qubits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Knaack%2C+H+M">H. M. Knaack</a>, <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Kwiatkowski%2C+A">A. Kwiatkowski</a>, <a href="/search/quant-ph?searchtype=author&query=Glancy%2C+S">S. Glancy</a>, <a href="/search/quant-ph?searchtype=author&query=Knill%2C+E">E. Knill</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</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="2102.12533v1-abstract-short" style="display: inline;"> Universal control of multiple qubits -- the ability to entangle qubits and to perform arbitrary individual qubit operations -- is a fundamental resource for quantum computation, simulation, and networking. Here, we implement a new laser-free scheme for universal control of trapped ion qubits based on microwave magnetic fields and radiofrequency magnetic field gradients. We demonstrate high-fidelit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.12533v1-abstract-full').style.display = 'inline'; document.getElementById('2102.12533v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.12533v1-abstract-full" style="display: none;"> Universal control of multiple qubits -- the ability to entangle qubits and to perform arbitrary individual qubit operations -- is a fundamental resource for quantum computation, simulation, and networking. Here, we implement a new laser-free scheme for universal control of trapped ion qubits based on microwave magnetic fields and radiofrequency magnetic field gradients. We demonstrate high-fidelity entanglement and individual control by creating symmetric and antisymmetric two-qubit maximally entangled states with fidelities in the intervals [0.9983, 1] and [0.9964, 0.9988], respectively, at 68% confidence, corrected for state initialization error. This technique is robust against multiple sources of decoherence, usable with essentially any trapped ion species, and has the potential to perform simultaneous entangling operations on many pairs of ions without increasing control signal power or complexity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.12533v1-abstract-full').style.display = 'none'; document.getElementById('2102.12533v1-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 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 597, 209-213 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.14342">arXiv:2009.14342</a> <span> [<a href="https://arxiv.org/pdf/2009.14342">pdf</a>, <a href="https://arxiv.org/format/2009.14342">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/10.1038/s41567-021-01237-9">10.1038/s41567-021-01237-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum amplification of boson-mediated interactions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Knaack%2C+H+M">H. M. Knaack</a>, <a href="/search/quant-ph?searchtype=author&query=Ge%2C+W">W. Ge</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Bollinger%2C+J+J">J. J. Bollinger</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</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="2009.14342v1-abstract-short" style="display: inline;"> Strong and precisely-controlled interactions between quantum objects are essential for quantum information processing, simulation, and sensing, and for the formation of exotic quantum matter. A well-established paradigm for coupling otherwise weakly-interacting quantum objects is to use auxiliary bosonic quantum excitations to mediate the interactions. Important examples include photon-mediated in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.14342v1-abstract-full').style.display = 'inline'; document.getElementById('2009.14342v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.14342v1-abstract-full" style="display: none;"> Strong and precisely-controlled interactions between quantum objects are essential for quantum information processing, simulation, and sensing, and for the formation of exotic quantum matter. A well-established paradigm for coupling otherwise weakly-interacting quantum objects is to use auxiliary bosonic quantum excitations to mediate the interactions. Important examples include photon-mediated interactions between atoms, superconducting qubits, and color centers in diamond, and phonon-mediated interactions between trapped ions and between optical and microwave photons. Boson-mediated interactions can in principle be amplified through parametric driving of the boson channel; the drive need not couple directly to the interacting quantum objects. This technique has been proposed for a variety of quantum platforms, but has not to date been realized in the laboratory. Here we experimentally demonstrate the amplification of a boson-mediated interaction between two trapped-ion qubits by parametric modulation of the trapping potential. The amplification provides up to a 3.25-fold increase in the interaction strength, validated by measuring the speedup of two-qubit entangling gates. This amplification technique can be used in any quantum platform where parametric modulation of the boson channel is possible, enabling exploration of new parameter regimes and enhanced quantum information processing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.14342v1-abstract-full').style.display = 'none'; document.getElementById('2009.14342v1-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 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </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, 4 figures, one parametric drive tone</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Physics 17, 898-902 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.14178">arXiv:1910.14178</a> <span> [<a href="https://arxiv.org/pdf/1910.14178">pdf</a>, <a href="https://arxiv.org/ps/1910.14178">ps</a>, <a href="https://arxiv.org/format/1910.14178">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/PhysRevA.101.042334">10.1103/PhysRevA.101.042334 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Laser-free trapped-ion entangling gates with simultaneous insensitivity to qubit and motional decoherence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Knaack%2C+H+M">H. M. Knaack</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</a>, <a href="/search/quant-ph?searchtype=author&query=Libby%2C+S+B">S. B. Libby</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="1910.14178v2-abstract-short" style="display: inline;"> The dominant error sources for state-of-the-art laser-free trapped-ion entangling gates are decoherence of the qubit state and the ion motion. The effect of these decoherence mechanisms can be suppressed with additional control fields, or with techniques that have the disadvantage of reducing gate speed. Here, we propose using a near-motional-frequency magnetic field gradient to implement a laser-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.14178v2-abstract-full').style.display = 'inline'; document.getElementById('1910.14178v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.14178v2-abstract-full" style="display: none;"> The dominant error sources for state-of-the-art laser-free trapped-ion entangling gates are decoherence of the qubit state and the ion motion. The effect of these decoherence mechanisms can be suppressed with additional control fields, or with techniques that have the disadvantage of reducing gate speed. Here, we propose using a near-motional-frequency magnetic field gradient to implement a laser-free gate that is simultaneously resilient to both types of decoherence, does not require additional control fields, and has a relatively small cost in gate speed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.14178v2-abstract-full').style.display = 'none'; document.getElementById('1910.14178v2-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> 30 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 101, 042334 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.02098">arXiv:1812.02098</a> <span> [<a href="https://arxiv.org/pdf/1812.02098">pdf</a>, <a href="https://arxiv.org/format/1812.02098">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/PhysRevLett.122.163201">10.1103/PhysRevLett.122.163201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Trapped-ion spin-motion coupling with microwaves and a near-motional oscillating magnetic field gradient </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</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="1812.02098v2-abstract-short" style="display: inline;"> We present a new method of spin-motion coupling for trapped ions using microwaves and a magnetic field gradient oscillating close to the ions' motional frequency. We demonstrate and characterize this coupling experimentally using a single ion in a surface-electrode trap that incorporates current-carrying electrodes to generate the microwave field and the oscillating magnetic field gradient. Using… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02098v2-abstract-full').style.display = 'inline'; document.getElementById('1812.02098v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.02098v2-abstract-full" style="display: none;"> We present a new method of spin-motion coupling for trapped ions using microwaves and a magnetic field gradient oscillating close to the ions' motional frequency. We demonstrate and characterize this coupling experimentally using a single ion in a surface-electrode trap that incorporates current-carrying electrodes to generate the microwave field and the oscillating magnetic field gradient. Using this method, we perform resolved-sideband cooling of a single motional mode to its ground state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.02098v2-abstract-full').style.display = 'none'; document.getElementById('1812.02098v2-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 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </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, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 122, 163201 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.01812">arXiv:1812.01812</a> <span> [<a href="https://arxiv.org/pdf/1812.01812">pdf</a>, <a href="https://arxiv.org/format/1812.01812">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/10.1126/science.aaw2884">10.1126/science.aaw2884 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum amplification of mechanical oscillator motion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Bollinger%2C+J+J">J. J. Bollinger</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</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="1812.01812v1-abstract-short" style="display: inline;"> Detection of the weakest forces in nature and the search for new physics are aided by increasingly sensitive measurements of the motion of mechanical oscillators. However, the attainable knowledge of an oscillator's motion is limited by quantum fluctuations that exist even if the oscillator is in its lowest possible energy state. Here we demonstrate a widely applicable technique for amplifying coh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.01812v1-abstract-full').style.display = 'inline'; document.getElementById('1812.01812v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.01812v1-abstract-full" style="display: none;"> Detection of the weakest forces in nature and the search for new physics are aided by increasingly sensitive measurements of the motion of mechanical oscillators. However, the attainable knowledge of an oscillator's motion is limited by quantum fluctuations that exist even if the oscillator is in its lowest possible energy state. Here we demonstrate a widely applicable technique for amplifying coherent displacements of a mechanical oscillator with initial magnitudes well below these zero-point fluctuations. When applying two orthogonal "squeezing" interactions before and after a small displacement, the displacement is amplified, ideally with no added quantum noise. We implement this protocol with a trapped-ion mechanical oscillator and measure an increase of up to 17.5(3) decibels in sensitivity to small displacements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.01812v1-abstract-full').style.display = 'none'; document.getElementById('1812.01812v1-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 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </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> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science 364, 1163 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.08300">arXiv:1810.08300</a> <span> [<a href="https://arxiv.org/pdf/1810.08300">pdf</a>, <a href="https://arxiv.org/ps/1810.08300">ps</a>, <a href="https://arxiv.org/format/1810.08300">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/10.1088/1367-2630/ab0be5">10.1088/1367-2630/ab0be5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Versatile laser-free trapped-ion entangling gates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Sutherland%2C+R+T">R. T. Sutherland</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">R. Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">S. C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">A. C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">D. J. Wineland</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">D. T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">D. H. Slichter</a>, <a href="/search/quant-ph?searchtype=author&query=Libby%2C+S+B">S. B. Libby</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="1810.08300v2-abstract-short" style="display: inline;"> We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By transforming into a `bichromatic' interaction picture, we show that either ${\hat蟽_蠁\otimes\hat蟽_蠁}$ or ${\hat蟽_{z}\otimes\hat蟽_{z}}$ geometric… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.08300v2-abstract-full').style.display = 'inline'; document.getElementById('1810.08300v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.08300v2-abstract-full" style="display: none;"> We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By transforming into a `bichromatic' interaction picture, we show that either ${\hat蟽_蠁\otimes\hat蟽_蠁}$ or ${\hat蟽_{z}\otimes\hat蟽_{z}}$ geometric phase gates can be performed. The gate basis is determined by selecting the microwave detuning. The driving parameters can be tuned to provide intrinsic dynamical decoupling from qubit frequency fluctuations. The ${\hat蟽_{z}\otimes\hat蟽_{z}}$ gates can be implemented in a novel manner which eases experimental constraints. We present numerical simulations of gate fidelities assuming realistic parameters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.08300v2-abstract-full').style.display = 'none'; document.getElementById('1810.08300v2-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 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 21 033033 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.03484">arXiv:1606.03484</a> <span> [<a href="https://arxiv.org/pdf/1606.03484">pdf</a>, <a href="https://arxiv.org/ps/1606.03484">ps</a>, <a href="https://arxiv.org/format/1606.03484">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="Optics">physics.optics</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/OPTICA.3.001294">10.1364/OPTICA.3.001294 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> VECSEL systems for generation and manipulation of trapped magnesium ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Burd%2C+S+C">Shaun C. Burd</a>, <a href="/search/quant-ph?searchtype=author&query=Allcock%2C+D+T+C">David T. C. Allcock</a>, <a href="/search/quant-ph?searchtype=author&query=Leinonen%2C+T">Tomi Leinonen</a>, <a href="/search/quant-ph?searchtype=author&query=Penttinen%2C+J">Jussi-Pekka Penttinen</a>, <a href="/search/quant-ph?searchtype=author&query=Slichter%2C+D+H">Daniel H. Slichter</a>, <a href="/search/quant-ph?searchtype=author&query=Srinivas%2C+R">Raghavendra Srinivas</a>, <a href="/search/quant-ph?searchtype=author&query=Wilson%2C+A+C">Andrew C. Wilson</a>, <a href="/search/quant-ph?searchtype=author&query=J%C3%B6rdens%2C+R">Robert J枚rdens</a>, <a href="/search/quant-ph?searchtype=author&query=Guina%2C+M">Mircea Guina</a>, <a href="/search/quant-ph?searchtype=author&query=Leibfried%2C+D">Dietrich Leibfried</a>, <a href="/search/quant-ph?searchtype=author&query=Wineland%2C+D+J">David J. Wineland</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="1606.03484v1-abstract-short" style="display: inline;"> Experiments in atomic, molecular, and optical (AMO) physics rely on lasers at many different wavelengths and with varying requirements on spectral linewidth, power, and intensity stability. Vertical external-cavity surface-emitting lasers (VECSELs), when combined with nonlinear frequency conversion, can potentially replace many of the laser systems currently in use. Here we present and characteriz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.03484v1-abstract-full').style.display = 'inline'; document.getElementById('1606.03484v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.03484v1-abstract-full" style="display: none;"> Experiments in atomic, molecular, and optical (AMO) physics rely on lasers at many different wavelengths and with varying requirements on spectral linewidth, power, and intensity stability. Vertical external-cavity surface-emitting lasers (VECSELs), when combined with nonlinear frequency conversion, can potentially replace many of the laser systems currently in use. Here we present and characterize VECSEL systems that can perform all laser-based tasks for quantum information processing experiments with trapped magnesium ions. For photoionization of neutral magnesium, 570.6$\,$nm light is generated with an intracavity frequency-doubled VECSEL containing a lithium triborate (LBO) crystal for second harmonic generation. External frequency doubling produces 285.3$\,$nm light for resonant interaction with the $^{1}S_{0}\leftrightarrow$ $^{1}P_{1}$ transition of neutral Mg. Using an externally frequency-quadrupled VECSEL, we implement Doppler cooling of $^{25}$Mg$^{+}$ on the 279.6$\,$nm $^{2}S_{1/2}\leftrightarrow$ $^{2}P_{3/2}$ cycling transition, repumping on the 280.4$\,$nm $^{2}S_{1/2}\leftrightarrow$ $^{2}P_{1/2}$ transition, coherent state manipulation, and resolved sideband cooling close to the motional ground state. Our systems serve as prototypes for applications in AMO requiring single-frequency, power-scalable laser sources at multiple wavelengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.03484v1-abstract-full').style.display = 'none'; document.getElementById('1606.03484v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </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 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optica 3, 1294 (2016) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: 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