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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/2410.15590">arXiv:2410.15590</a> <span> [<a href="https://arxiv.org/pdf/2410.15590">pdf</a>, <a href="https://arxiv.org/format/2410.15590">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> A 300 mm foundry silicon spin qubit unit cell exceeding 99% fidelity in all operations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Steinacker%2C+P">Paul Steinacker</a>, <a href="/search/cond-mat?searchtype=author&query=Stuyck%2C+N+D">Nard Dumoulin Stuyck</a>, <a href="/search/cond-mat?searchtype=author&query=Lim%2C+W+H">Wee Han Lim</a>, <a href="/search/cond-mat?searchtype=author&query=Tanttu%2C+T">Tuomo Tanttu</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+M">MengKe Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Nickl%2C+A">Andreas Nickl</a>, <a href="/search/cond-mat?searchtype=author&query=Serrano%2C+S">Santiago Serrano</a>, <a href="/search/cond-mat?searchtype=author&query=Candido%2C+M">Marco Candido</a>, <a href="/search/cond-mat?searchtype=author&query=Cifuentes%2C+J+D">Jesus D. Cifuentes</a>, <a href="/search/cond-mat?searchtype=author&query=Hudson%2C+F+E">Fay E. Hudson</a>, <a href="/search/cond-mat?searchtype=author&query=Chan%2C+K+W">Kok Wai Chan</a>, <a href="/search/cond-mat?searchtype=author&query=Kubicek%2C+S">Stefan Kubicek</a>, <a href="/search/cond-mat?searchtype=author&query=Jussot%2C+J">Julien Jussot</a>, <a href="/search/cond-mat?searchtype=author&query=Canvel%2C+Y">Yann Canvel</a>, <a href="/search/cond-mat?searchtype=author&query=Beyne%2C+S">Sofie Beyne</a>, <a href="/search/cond-mat?searchtype=author&query=Shimura%2C+Y">Yosuke Shimura</a>, <a href="/search/cond-mat?searchtype=author&query=Loo%2C+R">Roger Loo</a>, <a href="/search/cond-mat?searchtype=author&query=Godfrin%2C+C">Clement Godfrin</a>, <a href="/search/cond-mat?searchtype=author&query=Raes%2C+B">Bart Raes</a>, <a href="/search/cond-mat?searchtype=author&query=Baudot%2C+S">Sylvain Baudot</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+D">Danny Wan</a>, <a href="/search/cond-mat?searchtype=author&query=Laucht%2C+A">Arne Laucht</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+C+H">Chih Hwan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Saraiva%2C+A">Andre Saraiva</a>, <a href="/search/cond-mat?searchtype=author&query=Escott%2C+C+C">Christopher C. Escott</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.15590v2-abstract-short" style="display: inline;"> Fabrication of quantum processors in advanced 300 mm wafer-scale complementary metal-oxide-semiconductor (CMOS) foundries provides a unique scaling pathway towards commercially viable quantum computing with potentially millions of qubits on a single chip. Here, we show precise qubit operation of a silicon two-qubit device made in a 300 mm semiconductor processing line. The key metrics including si… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15590v2-abstract-full').style.display = 'inline'; document.getElementById('2410.15590v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.15590v2-abstract-full" style="display: none;"> Fabrication of quantum processors in advanced 300 mm wafer-scale complementary metal-oxide-semiconductor (CMOS) foundries provides a unique scaling pathway towards commercially viable quantum computing with potentially millions of qubits on a single chip. Here, we show precise qubit operation of a silicon two-qubit device made in a 300 mm semiconductor processing line. The key metrics including single- and two-qubit control fidelities exceed 99% and state preparation and measurement fidelity exceeds 99.9%, as evidenced by gate set tomography (GST). We report coherence and lifetimes up to $T_\mathrm{2}^{\mathrm{*}} = 30.4$ $渭$s, $T_\mathrm{2}^{\mathrm{Hahn}} = 803$ $渭$s, and $T_1 = 6.3$ s. Crucially, the dominant operational errors originate from residual nuclear spin carrying isotopes, solvable with further isotopic purification, rather than charge noise arising from the dielectric environment. Our results answer the longstanding question whether the favourable properties including high-fidelity operation and long coherence times can be preserved when transitioning from a tailored academic to an industrial semiconductor fabrication technology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.15590v2-abstract-full').style.display = 'none'; document.getElementById('2410.15590v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, 4 extended data figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.12731">arXiv:2409.12731</a> <span> [<a href="https://arxiv.org/pdf/2409.12731">pdf</a>, <a href="https://arxiv.org/format/2409.12731">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</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"> Industrial 300$\,$mm wafer processed spin qubits in natural silicon/silicon-germanium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Koch%2C+T">Thomas Koch</a>, <a href="/search/cond-mat?searchtype=author&query=Godfrin%2C+C">Clement Godfrin</a>, <a href="/search/cond-mat?searchtype=author&query=Adam%2C+V">Viktor Adam</a>, <a href="/search/cond-mat?searchtype=author&query=Ferrero%2C+J">Julian Ferrero</a>, <a href="/search/cond-mat?searchtype=author&query=Schroller%2C+D">Daniel Schroller</a>, <a href="/search/cond-mat?searchtype=author&query=Glaeser%2C+N">Noah Glaeser</a>, <a href="/search/cond-mat?searchtype=author&query=Kubicek%2C+S">Stefan Kubicek</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+R">Ruoyu Li</a>, <a href="/search/cond-mat?searchtype=author&query=Loo%2C+R">Roger Loo</a>, <a href="/search/cond-mat?searchtype=author&query=Massar%2C+S">Shana Massar</a>, <a href="/search/cond-mat?searchtype=author&query=Simion%2C+G">George Simion</a>, <a href="/search/cond-mat?searchtype=author&query=Wan%2C+D">Danny Wan</a>, <a href="/search/cond-mat?searchtype=author&query=De+Greve%2C+K">Kristiaan De Greve</a>, <a href="/search/cond-mat?searchtype=author&query=Wernsdorfer%2C+W">Wolfgang Wernsdorfer</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="2409.12731v2-abstract-short" style="display: inline;"> The realisation of an universal quantum computer will require the operation of thousands to millions of qubits. The possibility of using existing industrial semiconductor fabrication techniques and infrastructure for up-scaling and reproducibility makes silicon based spin qubits one of the most promising platforms to achieve this goal. The implementation of the up to now largest semiconductor base… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.12731v2-abstract-full').style.display = 'inline'; document.getElementById('2409.12731v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.12731v2-abstract-full" style="display: none;"> The realisation of an universal quantum computer will require the operation of thousands to millions of qubits. The possibility of using existing industrial semiconductor fabrication techniques and infrastructure for up-scaling and reproducibility makes silicon based spin qubits one of the most promising platforms to achieve this goal. The implementation of the up to now largest semiconductor based quantum processor was realized in a silicon/silicon-germanium heterostructure known for its low charge noise, long qubit coherence times and fast driving speeds, but the high structural complexity creates challenges for industrial implementations. Here we demonstrate quantum dots hosted in a natural Si/SiGe heterostructure fully fabricated by an industrial 300$\,$mm semiconductor wafer process line from heterostructure growth to Co micromagnet monolithic integration. We report charge noise values below 2$\,\mathrm{渭eV/\sqrt{Hz}}$, spin relaxation times of over 1$\,$s and coherence times $T_2^*$ and $T_2^H$ of 1$\,\mathrm{渭s}$ and 50$\,\mathrm{渭s}$ respectively, for quantum wells grown using natural silicon. Further, we achieve Rabi frequencies up to 5$\,$MHz and single qubit gate fidelities above 99$\,\%$. In addition to scalability, the high reproducibility of the 300$\,$mm processes enables the deterministic study of qubit metric dependencies on process parameters, which is essential for optimising qubit quality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.12731v2-abstract-full').style.display = 'none'; document.getElementById('2409.12731v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 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/1304.6392">arXiv:1304.6392</a> <span> [<a href="https://arxiv.org/pdf/1304.6392">pdf</a>, <a href="https://arxiv.org/ps/1304.6392">ps</a>, <a href="https://arxiv.org/format/1304.6392">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</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.111.218003">10.1103/PhysRevLett.111.218003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Shock Waves in Weakly Compressed Granular Media </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wildenberg%2C+S+v+d">Siet van den Wildenberg</a>, <a href="/search/cond-mat?searchtype=author&query=van+Loo%2C+R">Rogier van Loo</a>, <a href="/search/cond-mat?searchtype=author&query=van+Hecke%2C+M">Martin van Hecke</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="1304.6392v1-abstract-short" style="display: inline;"> We experimentally probe nonlinear wave propagation in weakly compressed granular media, and observe a crossover from quasi-linear sound waves at low impact, to shock waves at high impact. We show that this crossover grows with the confining pressure $P_0$, whereas the shock wave speed is independent of $P_0$ --- two hallmarks of granular shocks predicted recently. The shocks exhibit powerlaw atten… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.6392v1-abstract-full').style.display = 'inline'; document.getElementById('1304.6392v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.6392v1-abstract-full" style="display: none;"> We experimentally probe nonlinear wave propagation in weakly compressed granular media, and observe a crossover from quasi-linear sound waves at low impact, to shock waves at high impact. We show that this crossover grows with the confining pressure $P_0$, whereas the shock wave speed is independent of $P_0$ --- two hallmarks of granular shocks predicted recently. The shocks exhibit powerlaw attenuation, which we model with a logarithmic law implying that local dissipation is weak. We show that elastic and potential energy balance in the leading part of the shocks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.6392v1-abstract-full').style.display = 'none'; document.getElementById('1304.6392v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0904.2617">arXiv:0904.2617</a> <span> [<a href="https://arxiv.org/pdf/0904.2617">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Single-Electron Capacitance Spectroscopy of Individual Dopants in Silicon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gasseller%2C+M">M. Gasseller</a>, <a href="/search/cond-mat?searchtype=author&query=Loo%2C+R">R. Loo</a>, <a href="/search/cond-mat?searchtype=author&query=Harrison%2C+J+F">J. F. Harrison</a>, <a href="/search/cond-mat?searchtype=author&query=Caymax%2C+M">M. Caymax</a>, <a href="/search/cond-mat?searchtype=author&query=Rogge%2C+S">S. Rogge</a>, <a href="/search/cond-mat?searchtype=author&query=Tessmer%2C+S+H">S. H. Tessmer</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="0904.2617v2-abstract-short" style="display: inline;"> Motivated by recent transport experiments and proposed atomic-scale semiconductor devices, we present measurements that extend the reach of scanned-probe methods to discern the properties of individual dopants tens of nanometers below the surface of a silicon sample. Using a capacitance-based approach, we have both spatially-resolved individual subsurface boron acceptors and detected spectroscop… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0904.2617v2-abstract-full').style.display = 'inline'; document.getElementById('0904.2617v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0904.2617v2-abstract-full" style="display: none;"> Motivated by recent transport experiments and proposed atomic-scale semiconductor devices, we present measurements that extend the reach of scanned-probe methods to discern the properties of individual dopants tens of nanometers below the surface of a silicon sample. Using a capacitance-based approach, we have both spatially-resolved individual subsurface boron acceptors and detected spectroscopically single holes entering and leaving these minute systems of atoms. A resonance identified as the B+ state is shown to shift in energy from acceptor to acceptor. We examine this behavior with respect to nearest-neighbor distances. By directly measuring the quantum levels and testing the effect of dopant-dopant interactions, this method represents a valuable tool for the development of future atomic-scale semiconductor devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0904.2617v2-abstract-full').style.display = 'none'; document.getElementById('0904.2617v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 April, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages (main text is 5 pages), 3 figures and 4 supplementary figures</span> </p> </li> </ol> <div 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