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<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/2002.04133">arXiv:2002.04133</a> <span> [<a href="https://arxiv.org/pdf/2002.04133">pdf</a>, <a href="https://arxiv.org/format/2002.04133">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/10.1103/PhysRevA.102.043110">10.1103/PhysRevA.102.043110 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Efficient sideband cooling protocol for long trapped-ion chains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chen%2C+J+-">J. -S. Chen</a>, <a href="/search/physics?searchtype=author&query=Wright%2C+K">K. Wright</a>, <a href="/search/physics?searchtype=author&query=Pisenti%2C+N+C">N. C. Pisenti</a>, <a href="/search/physics?searchtype=author&query=Murphy%2C+D">D. Murphy</a>, <a href="/search/physics?searchtype=author&query=Beck%2C+K+M">K. M. Beck</a>, <a href="/search/physics?searchtype=author&query=Landsman%2C+K">K. Landsman</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">J. M. Amini</a>, <a href="/search/physics?searchtype=author&query=Nam%2C+Y">Y. Nam</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="2002.04133v1-abstract-short" style="display: inline;"> Trapped ions are a promising candidate for large scale quantum computation. Several systems have been built in both academic and industrial settings to implement modestly-sized quantum algorithms. Efficient cooling of the motional degrees of freedom is a key requirement for high-fidelity quantum operations using trapped ions. Here, we present a technique whereby individual ions are used to cool in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04133v1-abstract-full').style.display = 'inline'; document.getElementById('2002.04133v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.04133v1-abstract-full" style="display: none;"> Trapped ions are a promising candidate for large scale quantum computation. Several systems have been built in both academic and industrial settings to implement modestly-sized quantum algorithms. Efficient cooling of the motional degrees of freedom is a key requirement for high-fidelity quantum operations using trapped ions. Here, we present a technique whereby individual ions are used to cool individual motional modes in parallel, reducing the time required to bring an ion chain to its motional ground state. We demonstrate this technique experimentally and develop a model to understand the efficiency of our parallel sideband cooling technique compared to more traditional methods. This technique is applicable to any system using resolved sideband cooling of co-trapped atomic species and only requires individual addressing of the trapped particles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04133v1-abstract-full').style.display = 'none'; document.getElementById('2002.04133v1-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 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">7 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 102, 043110 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1607.00100">arXiv:1607.00100</a> <span> [<a href="https://arxiv.org/pdf/1607.00100">pdf</a>, <a href="https://arxiv.org/format/1607.00100">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="Optics">physics.optics</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/s41534-017-0006-6">10.1038/s41534-017-0006-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Scalable ion-photon quantum interface based on integrated diffractive mirrors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ghadimi%2C+M">M. Ghadimi</a>, <a href="/search/physics?searchtype=author&query=Bl%C5%ABms%2C+V">V. Bl奴ms</a>, <a href="/search/physics?searchtype=author&query=Norton%2C+B+G">B. G. Norton</a>, <a href="/search/physics?searchtype=author&query=Fisher%2C+P+M">P. M. Fisher</a>, <a href="/search/physics?searchtype=author&query=Connell%2C+S+C">S. C. Connell</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">J. M. Amini</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">C. Volin</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+H">H. Hayden</a>, <a href="/search/physics?searchtype=author&query=Pai%2C+C+S">C. S. Pai</a>, <a href="/search/physics?searchtype=author&query=Kielpinski%2C+D">D. Kielpinski</a>, <a href="/search/physics?searchtype=author&query=Lobino%2C+M">M. Lobino</a>, <a href="/search/physics?searchtype=author&query=Streed%2C+E+W">E. W. Streed</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="1607.00100v1-abstract-short" style="display: inline;"> Quantum networking links quantum processors through remote entanglement for distributed quantum information processing (QIP) and secure long-range communication. Trapped ions are a leading QIP platform, having demonstrated universal small-scale processors and roadmaps for large-scale implementation. Overall rates of ion-photon entanglement generation, essential for remote trapped ion entanglement,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.00100v1-abstract-full').style.display = 'inline'; document.getElementById('1607.00100v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1607.00100v1-abstract-full" style="display: none;"> Quantum networking links quantum processors through remote entanglement for distributed quantum information processing (QIP) and secure long-range communication. Trapped ions are a leading QIP platform, having demonstrated universal small-scale processors and roadmaps for large-scale implementation. Overall rates of ion-photon entanglement generation, essential for remote trapped ion entanglement, are limited by coupling efficiency into single mode fibres5 and scaling to many ions. Here we show a microfabricated trap with integrated diffractive mirrors that couples 4.1(6)% of the fluorescence from a $^{174}$Yb$^+$ ion into a single mode fibre, nearly triple the demonstrated bulk optics efficiency. The integrated optic collects 5.8(8)% of the 蟺 transition fluorescence, images the ion with sub-wavelength resolution, and couples 71(5)% of the collected light into the fibre. Our technology is suitable for entangling multiple ions in parallel and overcomes mode quality limitations of existing integrated optical interconnects. In addition, the efficiencies are sufficient for fault tolerant QIP. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1607.00100v1-abstract-full').style.display = 'none'; document.getElementById('1607.00100v1-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, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">5 pages, 3 figures, 26 references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Information 3, Article number: 4 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.05378">arXiv:1509.05378</a> <span> [<a href="https://arxiv.org/pdf/1509.05378">pdf</a>, <a href="https://arxiv.org/ps/1509.05378">ps</a>, <a href="https://arxiv.org/format/1509.05378">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/10.1088/1367-2630/18/2/023048">10.1088/1367-2630/18/2/023048 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Universal Control of Ion Qubits in a Scalable Microfabricated Planar Trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Herold%2C+C+D">Creston D. Herold</a>, <a href="/search/physics?searchtype=author&query=Fallek%2C+S+D">Spencer D. Fallek</a>, <a href="/search/physics?searchtype=author&query=Merrill%2C+J+T">J. True Merrill</a>, <a href="/search/physics?searchtype=author&query=Meier%2C+A+M">Adam M. Meier</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">Kenton R. Brown</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</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="1509.05378v2-abstract-short" style="display: inline;"> We demonstrate universal quantum control over chains of ions in a surface-electrode ion trap, including all the fundamental operations necessary to perform algorithms in a one-dimensional, nearest-neighbor quantum computing architecture. We realize both single-qubit operations and nearest-neighbor entangling gates with Raman laser beams, and we interleave the two gate types. We report average sing… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.05378v2-abstract-full').style.display = 'inline'; document.getElementById('1509.05378v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.05378v2-abstract-full" style="display: none;"> We demonstrate universal quantum control over chains of ions in a surface-electrode ion trap, including all the fundamental operations necessary to perform algorithms in a one-dimensional, nearest-neighbor quantum computing architecture. We realize both single-qubit operations and nearest-neighbor entangling gates with Raman laser beams, and we interleave the two gate types. We report average single-qubit gate fidelities as high as 0.970(1) for two-, three-, and four-ion chains, characterized with randomized benchmarking. We generate Bell states between the nearest-neighbor pairs of a three-ion chain, with fidelity up to 0.84(2). We combine one- and two-qubit gates to perform quantum process tomography of a CNOT gate in a two-ion chain, and we report an overall fidelity of 0.76(3). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.05378v2-abstract-full').style.display = 'none'; document.getElementById('1509.05378v2-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 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </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, 7 figures. Corrected pulse sequence label to PB1</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> C D Herold et al 2016 New J. Phys. 18 023048 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.00381">arXiv:1507.00381</a> <span> [<a href="https://arxiv.org/pdf/1507.00381">pdf</a>, <a href="https://arxiv.org/format/1507.00381">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.92.061402">10.1103/PhysRevA.92.061402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Modulating carrier and sideband coupling strengths in a standing wave gate beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=deLaubenfels%2C+T+E">Thomas E. deLaubenfels</a>, <a href="/search/physics?searchtype=author&query=Burkhardt%2C+K+A">Karl A. Burkhardt</a>, <a href="/search/physics?searchtype=author&query=Vittorini%2C+G">Grahame Vittorini</a>, <a href="/search/physics?searchtype=author&query=Merrill%2C+J+T">J. True Merrill</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">Kenneth R. Brown</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</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="1507.00381v2-abstract-short" style="display: inline;"> We control the relative coupling strength of carrier and first order motional sideband interactions of a trapped ion by placing it in a resonant optical standing wave. Our configuration uses the surface of a microfabricated chip trap as a mirror, avoiding technical challenges of in-vacuum optical cavities. Displacing the ion along the standing wave, we show a periodic suppression of the carrier an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.00381v2-abstract-full').style.display = 'inline'; document.getElementById('1507.00381v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.00381v2-abstract-full" style="display: none;"> We control the relative coupling strength of carrier and first order motional sideband interactions of a trapped ion by placing it in a resonant optical standing wave. Our configuration uses the surface of a microfabricated chip trap as a mirror, avoiding technical challenges of in-vacuum optical cavities. Displacing the ion along the standing wave, we show a periodic suppression of the carrier and sideband transitions with the cycles for the two cases $180^\circ$ out of phase with each other. This technique allows for suppression of off-resonant carrier excitations when addressing the motional sidebands, with applications in quantum simulation and quantum control. Using the standing wave fringes, we measure the relative ion height as a function of applied electric field, allowing for a precise measurement of ion displacement and, combined with measured micromotion amplitudes, a validation of trap numerical models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.00381v2-abstract-full').style.display = 'none'; document.getElementById('1507.00381v2-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 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 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. A 92, 061402 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.5576">arXiv:1412.5576</a> <span> [<a href="https://arxiv.org/pdf/1412.5576">pdf</a>, <a href="https://arxiv.org/format/1412.5576">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="Instrumentation and Detectors">physics.ins-det</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/10.1063/1.4917385">10.1063/1.4917385 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ball-grid array architecture for microfabricated ion traps </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guise%2C+N+D">Nicholas D. Guise</a>, <a href="/search/physics?searchtype=author&query=Fallek%2C+S+D">Spencer D. Fallek</a>, <a href="/search/physics?searchtype=author&query=Stevens%2C+K+E">Kelly E. Stevens</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">K. R. Brown</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Harter%2C+A+W">Alexa W. Harter</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Higashi%2C+R+E">Robert E. Higashi</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+S+T">Son Thai Lu</a>, <a href="/search/physics?searchtype=author&query=Chanhvongsak%2C+H+M">Helen M. Chanhvongsak</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+T+A">Thi A. Nguyen</a>, <a href="/search/physics?searchtype=author&query=Marcus%2C+M+S">Matthew S. Marcus</a>, <a href="/search/physics?searchtype=author&query=Ohnstein%2C+T+R">Thomas R. Ohnstein</a>, <a href="/search/physics?searchtype=author&query=Youngner%2C+D+W">Daniel W. Youngner</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="1412.5576v3-abstract-short" style="display: inline;"> State-of-the-art microfabricated ion traps for quantum information research are approaching nearly one hundred control electrodes. We report here on the development and testing of a new architecture for microfabricated ion traps, built around ball-grid array (BGA) connections, that is suitable for increasingly complex trap designs. In the BGA trap, through-substrate vias bring electrical signals f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.5576v3-abstract-full').style.display = 'inline'; document.getElementById('1412.5576v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.5576v3-abstract-full" style="display: none;"> State-of-the-art microfabricated ion traps for quantum information research are approaching nearly one hundred control electrodes. We report here on the development and testing of a new architecture for microfabricated ion traps, built around ball-grid array (BGA) connections, that is suitable for increasingly complex trap designs. In the BGA trap, through-substrate vias bring electrical signals from the back side of the trap die to the surface trap structure on the top side. Gold-ball bump bonds connect the back side of the trap die to an interposer for signal routing from the carrier. Trench capacitors fabricated into the trap die replace area-intensive surface or edge capacitors. Wirebonds in the BGA architecture are moved to the interposer. These last two features allow the trap die to be reduced to only the area required to produce trapping fields. The smaller trap dimensions allow tight focusing of an addressing laser beam for fast single-qubit rotations. Performance of the BGA trap as characterized with $^{40}$Ca$^+$ ions is comparable to previous surface-electrode traps in terms of ion heating rate, mode frequency stability, and storage lifetime. We demonstrate two-qubit entanglement operations with $^{171}$Yb$^+$ ions in a second BGA trap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.5576v3-abstract-full').style.display = 'none'; document.getElementById('1412.5576v3-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 May, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Appl. Phys. 117, 174901 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1403.3662">arXiv:1403.3662</a> <span> [<a href="https://arxiv.org/pdf/1403.3662">pdf</a>, <a href="https://arxiv.org/format/1403.3662">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4879136">10.1063/1.4879136 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-Vacuum Active Electronics for Microfabricated Ion Traps </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Guise%2C+N+D">Nicholas D. Guise</a>, <a href="/search/physics?searchtype=author&query=Fallek%2C+S+D">Spencer D. Fallek</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+H">Harley Hayden</a>, <a href="/search/physics?searchtype=author&query=Pai%2C+C">C-S Pai</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">K. R. Brown</a>, <a href="/search/physics?searchtype=author&query=Merrill%2C+J+T">J. True Merrill</a>, <a href="/search/physics?searchtype=author&query=Harter%2C+A+W">Alexa W. Harter</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Lust%2C+L+M">Lisa M. Lust</a>, <a href="/search/physics?searchtype=author&query=Muldoon%2C+K">Kelly Muldoon</a>, <a href="/search/physics?searchtype=author&query=Carlson%2C+D">Doug Carlson</a>, <a href="/search/physics?searchtype=author&query=Budach%2C+J">Jerry Budach</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="1403.3662v2-abstract-short" style="display: inline;"> The advent of microfabricated ion traps for the quantum information community has allowed research groups to build traps that incorporate an unprecedented number of trapping zones. However, as device complexity has grown, the number of digital-to-analog converter (DAC) channels needed to control these devices has grown as well, with some of the largest trap assemblies now requiring nearly one hund… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.3662v2-abstract-full').style.display = 'inline'; document.getElementById('1403.3662v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1403.3662v2-abstract-full" style="display: none;"> The advent of microfabricated ion traps for the quantum information community has allowed research groups to build traps that incorporate an unprecedented number of trapping zones. However, as device complexity has grown, the number of digital-to-analog converter (DAC) channels needed to control these devices has grown as well, with some of the largest trap assemblies now requiring nearly one hundred DAC channels. Providing electrical connections for these channels into a vacuum chamber can be bulky and difficult to scale beyond the current numbers of trap electrodes. This paper reports on the development and testing of an in-vacuum DAC system that uses only 9 vacuum feedthrough connections to control a 78-electrode microfabricated ion trap. The system is characterized by trapping single and multiple $^{40}$Ca$^+$ ions. The measured axial mode stability, ion heating rates, and transport fidelities for a trapped ion are comparable to systems with external(air-side) commercial DACs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1403.3662v2-abstract-full').style.display = 'none'; document.getElementById('1403.3662v2-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> 2 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 15 figures; slight revisions following journal review</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Rev. Sci. Instrum. 85, 063101 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1304.6636">arXiv:1304.6636</a> <span> [<a href="https://arxiv.org/pdf/1304.6636">pdf</a>, <a href="https://arxiv.org/format/1304.6636">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/10.1088/1367-2630/15/8/083053">10.1088/1367-2630/15/8/083053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spatially uniform single-qubit gate operations with near-field microwaves and composite pulse compensation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shappert%2C+C+M">Christopher M. Shappert</a>, <a href="/search/physics?searchtype=author&query=Merrill%2C+J+T">J. True Merrill</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">K. R. Brown</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Doret%2C+S+C">S. Charles Doret</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+H">Harley Hayden</a>, <a href="/search/physics?searchtype=author&query=Pai%2C+C+-">C. -S. Pai</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">Kenneth R. Brown</a>, <a href="/search/physics?searchtype=author&query=Harter%2C+A+W">Alexa W. Harter</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="1304.6636v1-abstract-short" style="display: inline;"> We present a microfabricated surface-electrode ion trap with a pair of integrated waveguides that generate a standing microwave field resonant with the 171Yb+ hyperfine qubit. The waveguides are engineered to position the wave antinode near the center of the trap, resulting in maximum field amplitude and uniformity along the trap axis. By calibrating the relative amplitudes and phases of the waveg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.6636v1-abstract-full').style.display = 'inline'; document.getElementById('1304.6636v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1304.6636v1-abstract-full" style="display: none;"> We present a microfabricated surface-electrode ion trap with a pair of integrated waveguides that generate a standing microwave field resonant with the 171Yb+ hyperfine qubit. The waveguides are engineered to position the wave antinode near the center of the trap, resulting in maximum field amplitude and uniformity along the trap axis. By calibrating the relative amplitudes and phases of the waveguide currents, we can control the polarization of the microwave field to reduce off-resonant coupling to undesired Zeeman sublevels. We demonstrate single-qubit pi-rotations as fast as 1 us with less than 6 % variation in Rabi frequency over an 800 um microwave interaction region. Fully compensating pulse sequences further improve the uniformity of X-gates across this interaction region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1304.6636v1-abstract-full').style.display = 'none'; document.getElementById('1304.6636v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 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">14 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/1211.6554">arXiv:1211.6554</a> <span> [<a href="https://arxiv.org/pdf/1211.6554">pdf</a>, <a href="https://arxiv.org/format/1211.6554">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.87.013437">10.1103/PhysRevA.87.013437 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Microwave Near-Field Quantum Control of Trapped Ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Warring%2C+U">U. Warring</a>, <a href="/search/physics?searchtype=author&query=Ospelkaus%2C+C">C. Ospelkaus</a>, <a href="/search/physics?searchtype=author&query=Colombe%2C+Y">Y. Colombe</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">K. R. Brown</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">J. M. Amini</a>, <a href="/search/physics?searchtype=author&query=Carsjens%2C+M">M. Carsjens</a>, <a href="/search/physics?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/physics?searchtype=author&query=Wineland%2C+D+J">D. 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="1211.6554v1-abstract-short" style="display: inline;"> Microwave near-field quantum control of spin and motional degrees of freedom of 25Mg+ ions can be used to generate two-ion entanglement, as recently demonstrated in Ospelkaus et al. [Nature 476, 181 (2011)]. Here, we describe additional details of the setup and calibration procedures for these experiments. We discuss the design and characteristics of the surface-electrode trap and the microwave sy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.6554v1-abstract-full').style.display = 'inline'; document.getElementById('1211.6554v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.6554v1-abstract-full" style="display: none;"> Microwave near-field quantum control of spin and motional degrees of freedom of 25Mg+ ions can be used to generate two-ion entanglement, as recently demonstrated in Ospelkaus et al. [Nature 476, 181 (2011)]. Here, we describe additional details of the setup and calibration procedures for these experiments. We discuss the design and characteristics of the surface-electrode trap and the microwave system, and compare experimental measurements of the microwave near-fields with numerical simulations. Additionally, we present a method that utilizes oscillating magnetic-field gradients to detect micromotion induced by the ponderomotive radio-frequency potential in linear traps. Finally, we discuss the present limitations of microwave-driven two-ion entangling gates in our system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.6554v1-abstract-full').style.display = 'none'; document.getElementById('1211.6554v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2012. </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 and 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 87, 013437 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.3655">arXiv:1210.3655</a> <span> [<a href="https://arxiv.org/pdf/1210.3655">pdf</a>, <a href="https://arxiv.org/ps/1210.3655">ps</a>, <a href="https://arxiv.org/format/1210.3655">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/10.1088/1367-2630/15/3/033004">10.1088/1367-2630/15/3/033004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Reliable transport through a microfabricated X-junction surface-electrode ion trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wright%2C+K">Kenneth Wright</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Faircloth%2C+D+L">Daniel L. Faircloth</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Doret%2C+S+C">S. Charles Doret</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+H">Harley Hayden</a>, <a href="/search/physics?searchtype=author&query=Pai%2C+C+-">C. -S. Pai</a>, <a href="/search/physics?searchtype=author&query=Landgren%2C+D+W">David W. Landgren</a>, <a href="/search/physics?searchtype=author&query=Denison%2C+D">Douglas Denison</a>, <a href="/search/physics?searchtype=author&query=Killian%2C+T">Tyler Killian</a>, <a href="/search/physics?searchtype=author&query=Slusher%2C+R+E">Richart E. Slusher</a>, <a href="/search/physics?searchtype=author&query=Harter%2C+A+W">Alexa W. Harter</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="1210.3655v3-abstract-short" style="display: inline;"> We report the design, fabrication, and characterization of a microfabricated surface-electrode ion trap that supports controlled transport through the two-dimensional intersection of linear trapping zones arranged in a ninety-degree cross. The trap is fabricated with very-large-scalable-integration (VLSI) techniques which are compatible with scaling to a larger quantum information processor. The s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3655v3-abstract-full').style.display = 'inline'; document.getElementById('1210.3655v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.3655v3-abstract-full" style="display: none;"> We report the design, fabrication, and characterization of a microfabricated surface-electrode ion trap that supports controlled transport through the two-dimensional intersection of linear trapping zones arranged in a ninety-degree cross. The trap is fabricated with very-large-scalable-integration (VLSI) techniques which are compatible with scaling to a larger quantum information processor. The shape of the radio-frequency (RF) electrodes is optimized with a genetic algorithm to minimize axial pseudopotential barriers and to minimize ion heating during transport. Seventy-eight independent DC control electrodes enable fine control of the trapping potentials. We demonstrate reliable ion transport between junction legs, trapping of ion chains with nearly-equal spacing in one of the trap's linear sections, and merging and splitting ions from these chains. Doppler-cooled ions survive more than 10^5 round-trip transits between junction legs without loss and more than sixty-five consecutive round trips without laser cooling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3655v3-abstract-full').style.display = 'none'; document.getElementById('1210.3655v3-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 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 15 033004 (2013) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1204.4147">arXiv:1204.4147</a> <span> [<a href="https://arxiv.org/pdf/1204.4147">pdf</a>, <a href="https://arxiv.org/format/1204.4147">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/10.1088/1367-2630/14/7/073012">10.1088/1367-2630/14/7/073012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Controlling trapping potentials and stray electric fields in a microfabricated ion trap through design and compensation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Doret%2C+S+C">S. Charles Doret</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Wright%2C+K">Kenneth Wright</a>, <a href="/search/physics?searchtype=author&query=Volin%2C+C">Curtis Volin</a>, <a href="/search/physics?searchtype=author&query=Killian%2C+T">Tyler Killian</a>, <a href="/search/physics?searchtype=author&query=Ozakin%2C+A">Arkadas Ozakin</a>, <a href="/search/physics?searchtype=author&query=Denison%2C+D">Douglas Denison</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+H">Harley Hayden</a>, <a href="/search/physics?searchtype=author&query=Pai%2C+C+-">C. -S. Pai</a>, <a href="/search/physics?searchtype=author&query=Slusher%2C+R+E">Richart E. Slusher</a>, <a href="/search/physics?searchtype=author&query=Harter%2C+A+W">Alexa W. Harter</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="1204.4147v3-abstract-short" style="display: inline;"> Recent advances in quantum information processing with trapped ions have demonstrated the need for new ion trap architectures capable of holding and manipulating chains of many (>10) ions. Here we present the design and detailed characterization of a new linear trap, microfabricated with scalable complementary metal-oxide-semiconductor (CMOS) techniques, that is well-suited to this challenge. Fort… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.4147v3-abstract-full').style.display = 'inline'; document.getElementById('1204.4147v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1204.4147v3-abstract-full" style="display: none;"> Recent advances in quantum information processing with trapped ions have demonstrated the need for new ion trap architectures capable of holding and manipulating chains of many (>10) ions. Here we present the design and detailed characterization of a new linear trap, microfabricated with scalable complementary metal-oxide-semiconductor (CMOS) techniques, that is well-suited to this challenge. Forty-four individually controlled DC electrodes provide the many degrees of freedom required to construct anharmonic potential wells, shuttle ions, merge and split ion chains, precisely tune secular mode frequencies, and adjust the orientation of trap axes. Microfabricated capacitors on DC electrodes suppress radio-frequency pickup and excess micromotion, while a top-level ground layer simplifies modeling of electric fields and protects trap structures underneath. A localized aperture in the substrate provides access to the trapping region from an oven below, permitting deterministic loading of particular isotopic/elemental sequences via species-selective photoionization. The shapes of the aperture and radio-frequency electrodes are optimized to minimize perturbation of the trapping pseudopotential. Laboratory experiments verify simulated potentials and characterize trapping lifetimes, stray electric fields, and ion heating rates, while measurement and cancellation of spatially-varying stray electric fields permits the formation of nearly-equally spaced ion chains. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.4147v3-abstract-full').style.display = 'none'; document.getElementById('1204.4147v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 July, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 April, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2012. </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 (including references), 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 14 (2012) 073012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.3573">arXiv:1104.3573</a> <span> [<a href="https://arxiv.org/pdf/1104.3573">pdf</a>, <a href="https://arxiv.org/format/1104.3573">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/nature10290">10.1038/nature10290 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Microwave quantum logic gates for trapped ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ospelkaus%2C+C">C. Ospelkaus</a>, <a href="/search/physics?searchtype=author&query=Warring%2C+U">U. Warring</a>, <a href="/search/physics?searchtype=author&query=Colombe%2C+Y">Y. Colombe</a>, <a href="/search/physics?searchtype=author&query=Brown%2C+K+R">K. R. Brown</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">J. M. Amini</a>, <a href="/search/physics?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/physics?searchtype=author&query=Wineland%2C+D+J">D. 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="1104.3573v3-abstract-short" style="display: inline;"> Control over physical systems at the quantum level is a goal shared by scientists in fields as diverse as metrology, information processing, simulation and chemistry. For trapped atomic ions, the quantized motional and internal degrees of freedom can be coherently manipulated with laser light. Similar control is difficult to achieve with radio frequency or microwave radiation because the essential… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.3573v3-abstract-full').style.display = 'inline'; document.getElementById('1104.3573v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.3573v3-abstract-full" style="display: none;"> Control over physical systems at the quantum level is a goal shared by scientists in fields as diverse as metrology, information processing, simulation and chemistry. For trapped atomic ions, the quantized motional and internal degrees of freedom can be coherently manipulated with laser light. Similar control is difficult to achieve with radio frequency or microwave radiation because the essential coupling between internal degrees of freedom and motion requires significant field changes over the extent of the atoms' motion. The field gradients are negligible at these frequencies for freely propagating fields; however, stronger gradients can be generated in the near-field of microwave currents in structures smaller than the free-space wavelength. In the experiments reported here, we coherently manipulate the internal quantum states of the ions on time scales of 20 ns. We also generate entanglement between the internal degrees of freedom of two atoms with a gate operation suitable for general quantum computation. We implement both operations through the magnetic fields from microwave currents in electrodes that are integrated into the micro-fabricated trap structure and create an entangled state with fidelity 76(3) %. This approach, where the quantum control mechanism is integrated into the trapping device in a scalable manner, can potentially benefit quantum information processing, simulation and spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.3573v3-abstract-full').style.display = 'none'; document.getElementById('1104.3573v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </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">22 pages, 4 figures, accepted as a letter to Nature</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 476, 181 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0707.1528">arXiv:0707.1528</a> <span> [<a href="https://arxiv.org/pdf/0707.1528">pdf</a>, <a href="https://arxiv.org/ps/0707.1528">ps</a>, <a href="https://arxiv.org/format/0707.1528">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.76.033411">10.1103/PhysRevA.76.033411 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simplified motional heating rate measurements of trapped ions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Epstein%2C+R+J">R. J. Epstein</a>, <a href="/search/physics?searchtype=author&query=Seidelin%2C+S">S. Seidelin</a>, <a href="/search/physics?searchtype=author&query=Leibfried%2C+D">D. Leibfried</a>, <a href="/search/physics?searchtype=author&query=Wesenberg%2C+J+H">J. H. Wesenberg</a>, <a href="/search/physics?searchtype=author&query=Bollinger%2C+J+J">J. J. Bollinger</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">J. M. Amini</a>, <a href="/search/physics?searchtype=author&query=Blakestad%2C+R+B">R. B. Blakestad</a>, <a href="/search/physics?searchtype=author&query=Britton%2C+J">J. Britton</a>, <a href="/search/physics?searchtype=author&query=Home%2C+J+P">J. P. Home</a>, <a href="/search/physics?searchtype=author&query=Itano%2C+W+M">W. M. Itano</a>, <a href="/search/physics?searchtype=author&query=Jost%2C+J+D">J. D. Jost</a>, <a href="/search/physics?searchtype=author&query=Knill%2C+E">E. Knill</a>, <a href="/search/physics?searchtype=author&query=Langer%2C+C">C. Langer</a>, <a href="/search/physics?searchtype=author&query=Ozeri%2C+R">R. Ozeri</a>, <a href="/search/physics?searchtype=author&query=Shiga%2C+N">N. Shiga</a>, <a href="/search/physics?searchtype=author&query=Wineland%2C+D+J">D. 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="0707.1528v1-abstract-short" style="display: inline;"> We have measured motional heating rates of trapped atomic ions, a factor that can influence multi-ion quantum logic gate fidelities. Two simplified techniques were developed for this purpose: one relies on Raman sideband detection implemented with a single laser source, while the second is even simpler and is based on time-resolved fluorescence detection during Doppler recooling. We applied thes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.1528v1-abstract-full').style.display = 'inline'; document.getElementById('0707.1528v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0707.1528v1-abstract-full" style="display: none;"> We have measured motional heating rates of trapped atomic ions, a factor that can influence multi-ion quantum logic gate fidelities. Two simplified techniques were developed for this purpose: one relies on Raman sideband detection implemented with a single laser source, while the second is even simpler and is based on time-resolved fluorescence detection during Doppler recooling. We applied these methods to determine heating rates in a microfrabricated surface-electrode trap made of gold on fused quartz, which traps ions 40 microns above its surface. Heating rates obtained from the two techniques were found to be in reasonable agreement. In addition, the trap gives rise to a heating rate of 300 plus or minus 30 per second for a motional frequency of 5.25 MHz, substantially below the trend observed in other traps. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0707.1528v1-abstract-full').style.display = 'none'; document.getElementById('0707.1528v1-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, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 76, 033411 (2007) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0705.4428">arXiv:0705.4428</a> <span> [<a href="https://arxiv.org/pdf/0705.4428">pdf</a>, <a href="https://arxiv.org/ps/0705.4428">ps</a>, <a href="https://arxiv.org/format/0705.4428">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> </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/10.1142/S0218271807011395">10.1142/S0218271807011395 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron electric dipole moment experiment using electric-field quantized slow cesium atoms </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Munger%2C+C+T">Charles T. Munger Jr.</a>, <a href="/search/physics?searchtype=author&query=Gould%2C+H">Harvey Gould</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="0705.4428v1-abstract-short" style="display: inline;"> A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between states of unequal mF and, along with the low (approximately 3 m/s) velocity, suppresses… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.4428v1-abstract-full').style.display = 'inline'; document.getElementById('0705.4428v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0705.4428v1-abstract-full" style="display: none;"> A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than 200 pT, an electric field of 6 MV/m lifts the degeneracy between states of unequal mF and, along with the low (approximately 3 m/s) velocity, suppresses the systematic effect from the motional magnetic field. The low velocity and small residual magnetic field have made it possible to induce transitions between states and to perform state preparation, analysis, and detection in regions free of applied static magnetic and electric fields. This experiment demonstrates techniques that may be used to improve the e-EDM limit by two orders of magnitude, but it is not in itself a sensitive e-EDM search, mostly due to limitations of the laser system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.4428v1-abstract-full').style.display = 'none'; document.getElementById('0705.4428v1-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 May, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2007. </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, 8 figures, accepted for publication in Phys. Rev. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Int.J.Mod.Phys.D16:2337-2342,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0603127">arXiv:physics/0603127</a> <span> [<a href="https://arxiv.org/pdf/physics/0603127">pdf</a>, <a href="https://arxiv.org/ps/physics/0603127">ps</a>, <a href="https://arxiv.org/format/physics/0603127">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-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.72.043406">10.1103/PhysRevA.72.043406 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Focusing a fountain of neutral cesium atoms with an electrostatic lens triplet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kalnins%2C+J+G">Juris G. Kalnins</a>, <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Gould%2C+H">Harvey Gould</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="physics/0603127v1-abstract-short" style="display: inline;"> An electrostatic lens with three focusing elements in an alternating-gradient configuration is used to focus a fountain of cesium atoms in their ground (strong-field-seeking) state. The lens electrodes are shaped to produce only sextupole plus dipole equipotentials which avoids adding the unnecessary nonlinear forces present in cylindrical lenses. Defocusing between lenses is greatly reduced by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0603127v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0603127v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0603127v1-abstract-full" style="display: none;"> An electrostatic lens with three focusing elements in an alternating-gradient configuration is used to focus a fountain of cesium atoms in their ground (strong-field-seeking) state. The lens electrodes are shaped to produce only sextupole plus dipole equipotentials which avoids adding the unnecessary nonlinear forces present in cylindrical lenses. Defocusing between lenses is greatly reduced by having all of the main electric fields point in the same direction and be of nearly equal magnitude. The addition of the third lens gave us better control of the focusing strength in the two transverse planes and allowed focusing of the beam to half the image size in both planes. The beam envelope was calculated for lens voltages selected to produced specific focusing properties. The calculations, starting from first principles, were compared with measured beam sizes and found to be in good agreement. Application to fountain experiments, atomic clocks, and focusing polar molecules in strong-field-seeking states is discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0603127v1-abstract-full').style.display = 'none'; document.getElementById('physics/0603127v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 March, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2006. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LBNL-57137 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A72, 043406 (2005) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0602011">arXiv:physics/0602011</a> <span> [<a href="https://arxiv.org/pdf/physics/0602011">pdf</a>, <a href="https://arxiv.org/ps/physics/0602011">ps</a>, <a href="https://arxiv.org/format/physics/0602011">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="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</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.75.063416">10.1103/PhysRevA.75.063416 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Demonstration of a Cold Atom Fountain Electron Electric Dipole Moment Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Munger%2C+C+T">Charles T. Munger Jr.</a>, <a href="/search/physics?searchtype=author&query=Gould%2C+H">Harvey Gould</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="physics/0602011v2-abstract-short" style="display: inline;"> A Cs fountain electron electric dipole moment (EDM) experiment using electric-field quantization is demonstrated. With magnetic fields reduced to 200 pT or less, the electric field lifts the degeneracy between hyperfine levels of different|mF| and, along with the slow beam and fountain geometry, suppresses systematics from motional magnetic fields. Transitions are induced and the atoms polarized… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0602011v2-abstract-full').style.display = 'inline'; document.getElementById('physics/0602011v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0602011v2-abstract-full" style="display: none;"> A Cs fountain electron electric dipole moment (EDM) experiment using electric-field quantization is demonstrated. With magnetic fields reduced to 200 pT or less, the electric field lifts the degeneracy between hyperfine levels of different|mF| and, along with the slow beam and fountain geometry, suppresses systematics from motional magnetic fields. Transitions are induced and the atoms polarized and analyzed in field-free regions. The feasibility of reaching a sensitivity to an electron EDM of 2 x 10 exp(-50) C-m [1.3 x 10 exp(-29) e-cm] in a cesium fountain experiment is discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0602011v2-abstract-full').style.display = 'none'; document.getElementById('physics/0602011v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 March, 2006; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 February, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2006. </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">4 pages, 4 figures, references to neutrino flavor added and grammar corrected</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0305074">arXiv:physics/0305074</a> <span> [<a href="https://arxiv.org/pdf/physics/0305074">pdf</a>, <a href="https://arxiv.org/ps/physics/0305074">ps</a>, <a href="https://arxiv.org/format/physics/0305074">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="Chemical Physics">physics.chem-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.91.153001">10.1103/PhysRevLett.91.153001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High precision measurement of the static dipole polarizability of cesium </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amini%2C+J+M">Jason M. Amini</a>, <a href="/search/physics?searchtype=author&query=Gould%2C+H">Harvey Gould</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="physics/0305074v2-abstract-short" style="display: inline;"> The cesium 6S_1/2 scalar dipole polarizability alpha_0 has been determined from the time-of-flight of laser cooled and launched cesium atoms traveling through an electric field. We find alpha_0 = 6.611+-0.009 x 10^-39 C m^2/V= 59.42+-0.08 x 10^-24 cm^3 = 401.0+-0.6 a_0^3. The 0.14% uncertainty is a factor of fourteen improvement over the previous measurement. Values for the 6P_1/2 and 6P_3/2 lif… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0305074v2-abstract-full').style.display = 'inline'; document.getElementById('physics/0305074v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0305074v2-abstract-full" style="display: none;"> The cesium 6S_1/2 scalar dipole polarizability alpha_0 has been determined from the time-of-flight of laser cooled and launched cesium atoms traveling through an electric field. We find alpha_0 = 6.611+-0.009 x 10^-39 C m^2/V= 59.42+-0.08 x 10^-24 cm^3 = 401.0+-0.6 a_0^3. The 0.14% uncertainty is a factor of fourteen improvement over the previous measurement. Values for the 6P_1/2 and 6P_3/2 lifetimes and the 6S_1/2 cesium-cesium dispersion coefficient C_6 are determined from alpha_0 using the procedure of Derevianko and Porsev [Phys. Rev. A 65, 053403 (2002)]. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0305074v2-abstract-full').style.display = 'none'; document.getElementById('physics/0305074v2-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, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 May, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2003. </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">4 pages and 7 figures. 2nd version: Small changes to imrove clarity prior to final acceptance by PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LBNL-52051 </p> </li> </ol> <div 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