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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/2408.06317">arXiv:2408.06317</a> <span> [<a href="https://arxiv.org/pdf/2408.06317">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Generation of hypercubic cluster states in 1-4 dimensions in a simple optical system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+Z">Zhifan Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=de+Araujo%2C+L+E+E">Lu铆s E. E. de Araujo</a>, <a href="/search/quant-ph?searchtype=author&query=Dimario%2C+M">Matt Dimario</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+J">Jie Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Su%2C+J">Jing Su</a>, <a href="/search/quant-ph?searchtype=author&query=Wu%2C+M">Meng-Chang Wu</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">Kevin M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</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="2408.06317v1-abstract-short" style="display: inline;"> Entangled graph states can be used for quantum sensing and computing applications. Error correction in measurement-based quantum computing schemes will require the construction of cluster states in at least 3 dimensions. Here we generate 1-, 2-, 3-, and 4-dimensional optical frequency-mode cluster states by sending broadband 2-mode vacuum-squeezed light through an electro-optical modulator (EOM) d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.06317v1-abstract-full').style.display = 'inline'; document.getElementById('2408.06317v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.06317v1-abstract-full" style="display: none;"> Entangled graph states can be used for quantum sensing and computing applications. Error correction in measurement-based quantum computing schemes will require the construction of cluster states in at least 3 dimensions. Here we generate 1-, 2-, 3-, and 4-dimensional optical frequency-mode cluster states by sending broadband 2-mode vacuum-squeezed light through an electro-optical modulator (EOM) driven with multiple frequencies. We create the squeezed light using 4-wave mixing in Rb atomic vapor and mix the sideband frequencies (qumodes) using an EOM, as proposed by Zhu et al. (1), producing a pattern of entanglement correlations that constitute continuous-variable graph states containing up to several hundred qumodes. We verify the entanglement structure by using homodyne measurements to construct the covariance matrices and evaluate the nullifiers. This technique enables scaling of optical cluster states to multiple dimensions without increasing loss. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.06317v1-abstract-full').style.display = 'none'; document.getElementById('2408.06317v1-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 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2310.11900">arXiv:2310.11900</a> <span> [<a href="https://arxiv.org/pdf/2310.11900">pdf</a>, <a href="https://arxiv.org/format/2310.11900">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"> Properties of Two-Mode Quadrature Squeezing from Four-wave Mixing in Rubidium Vapor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=De+Araujo%2C+L+E+E">Lu脥s E. E. De Araujo</a>, <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+Z">Zhifan Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=Dimario%2C+M">Matt Dimario</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+J">Jie Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">Kevin M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2310.11900v1-abstract-short" style="display: inline;"> We present a study of homodyne measurements of two-mode, vacuum-seeded, quadrature-squeezed light generated by four-wave mixing in warm rubidium vapor. Our results reveal that the vacuum squeezing can extend down to measurement frequencies of less than 1 Hz, and the squeezing bandwidth, similar to the seeded intensity-difference squeezing measured in this system, reaches up to approximately 20 MHz… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11900v1-abstract-full').style.display = 'inline'; document.getElementById('2310.11900v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.11900v1-abstract-full" style="display: none;"> We present a study of homodyne measurements of two-mode, vacuum-seeded, quadrature-squeezed light generated by four-wave mixing in warm rubidium vapor. Our results reveal that the vacuum squeezing can extend down to measurement frequencies of less than 1 Hz, and the squeezing bandwidth, similar to the seeded intensity-difference squeezing measured in this system, reaches up to approximately 20 MHz for typical pump parameters. By dividing the squeezing bandwidth into smaller frequency bins, we show that different sideband frequencies represent independent sources of two-mode squeezing. Such frequency bins may provide useful qumodes for quantum information processing experiments. We also investigate the impact of group velocity delays on the correlations in the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11900v1-abstract-full').style.display = 'none'; document.getElementById('2310.11900v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.13716">arXiv:2306.13716</a> <span> [<a href="https://arxiv.org/pdf/2306.13716">pdf</a>, <a href="https://arxiv.org/format/2306.13716">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/10.1364/OPTICAQ.505870">10.1364/OPTICAQ.505870 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nonlocal phase modulation of multimode, continuous-variable twin beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Zhou%2C+Z">Zhifan Zhou</a>, <a href="/search/quant-ph?searchtype=author&query=de+Araujo%2C+L+E+E">Lu谋s E. E. de Araujo</a>, <a href="/search/quant-ph?searchtype=author&query=DiMario%2C+M">Matt DiMario</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Zhao%2C+J">Jie Zhao</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">Kevin M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</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="2306.13716v1-abstract-short" style="display: inline;"> We investigate experimentally the nonlocal phase modulation of multiple-frequency-mode, continuous-variable entangled twin beams. We use a pair of electro-optical phase modulators to modulate the entangled probe and conjugate light beams produced by four-wave mixing in hot Rb vapor. A single phase modulator in either one of the twin beams reduces the two-mode squeezing signal, and we find that the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.13716v1-abstract-full').style.display = 'inline'; document.getElementById('2306.13716v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.13716v1-abstract-full" style="display: none;"> We investigate experimentally the nonlocal phase modulation of multiple-frequency-mode, continuous-variable entangled twin beams. We use a pair of electro-optical phase modulators to modulate the entangled probe and conjugate light beams produced by four-wave mixing in hot Rb vapor. A single phase modulator in either one of the twin beams reduces the two-mode squeezing signal, and we find that the modulations interfere nonlocally to modify the beam correlations. The nonlocal modulation of the beams can produce quantum correlations among frequency modes of the multimode fields. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.13716v1-abstract-full').style.display = 'none'; document.getElementById('2306.13716v1-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 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optica Quantum Vol. 1, Issue 2, pp. 71-77 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.04314">arXiv:1802.04314</a> <span> [<a href="https://arxiv.org/pdf/1802.04314">pdf</a>, <a href="https://arxiv.org/format/1802.04314">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/10.1364/OE.26.000391">10.1364/OE.26.000391 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimized phase sensing in a truncated SU(1,1) interferometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Gupta%2C+P">Prasoon Gupta</a>, <a href="/search/quant-ph?searchtype=author&query=Schmittberger%2C+B+L">Bonnie L. Schmittberger</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">Brian E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">Kevin M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</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="1802.04314v1-abstract-short" style="display: inline;"> Homodyne detection is often used for interferometers based on nonlinear optical gain media. For the configuration of a seeded, 'truncated SU(1,1)' interferometer Anderson et al. (Phys. Rev. A 95, 063843 (2017)) showed how to optimize the homodyne detection scheme and demonstrated theoretically that it can saturate the quantum Cramer-Rao bound for phase estimation. In this work we extend those resu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.04314v1-abstract-full').style.display = 'inline'; document.getElementById('1802.04314v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.04314v1-abstract-full" style="display: none;"> Homodyne detection is often used for interferometers based on nonlinear optical gain media. For the configuration of a seeded, 'truncated SU(1,1)' interferometer Anderson et al. (Phys. Rev. A 95, 063843 (2017)) showed how to optimize the homodyne detection scheme and demonstrated theoretically that it can saturate the quantum Cramer-Rao bound for phase estimation. In this work we extend those results by taking into account loss in the truncated SU(1,1) interferometer and determining the optimized homodyne detection scheme for phase measurement. Further, we build a truncated SU(1,1) interferometer and experimentally demonstrate that this optimized scheme achieves a reduction in noise level, corresponding to an enhanced potential phase sensitivity, compared to a typical homodyne detection scheme for a two-mode squeezed state. In doing so, we also demonstrate an improvement in the degree to which we can beat the standard quantum limit with this device. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.04314v1-abstract-full').style.display = 'none'; document.getElementById('1802.04314v1-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 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">11 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Vol. 26, Issue 1, pp. 391-401 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1704.04261">arXiv:1704.04261</a> <span> [<a href="https://arxiv.org/pdf/1704.04261">pdf</a>, <a href="https://arxiv.org/format/1704.04261">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.95.063843">10.1103/PhysRevA.95.063843 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimal phase measurements with bright and vacuum-seeded SU(1,1) interferometers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Schmittberger%2C+B+L">B. L. Schmittberger</a>, <a href="/search/quant-ph?searchtype=author&query=Gupta%2C+P">P. Gupta</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">K. M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">P. D. Lett</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="1704.04261v1-abstract-short" style="display: inline;"> The SU(1,1) interferometer can be thought of as a Mach-Zehnder interferometer with its linear beamsplitters replaced with parametric nonlinear optical processes. We consider the cases of bright and vacuum-seeded SU(1,1) interferometers using intensity or homodyne detectors. A simplified, truncated scheme with only one nonlinear interaction is introduced, which not only beats conventional intensity… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.04261v1-abstract-full').style.display = 'inline'; document.getElementById('1704.04261v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1704.04261v1-abstract-full" style="display: none;"> The SU(1,1) interferometer can be thought of as a Mach-Zehnder interferometer with its linear beamsplitters replaced with parametric nonlinear optical processes. We consider the cases of bright and vacuum-seeded SU(1,1) interferometers using intensity or homodyne detectors. A simplified, truncated scheme with only one nonlinear interaction is introduced, which not only beats conventional intensity detection with a bright seed, but can saturate the phase sensitivity bound set by the quantum Fisher information. We also show that the truncated scheme achieves a sub-shot-noise phase sensitivity in the vacuum-seeded case, despite the phase-sensing optical beams having no well-defined phase. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1704.04261v1-abstract-full').style.display = 'none'; document.getElementById('1704.04261v1-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 95, 063843 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.06891">arXiv:1610.06891</a> <span> [<a href="https://arxiv.org/pdf/1610.06891">pdf</a>, <a href="https://arxiv.org/format/1610.06891">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/10.1364/OPTICA.4.000752">10.1364/OPTICA.4.000752 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Phase sensing beyond the standard quantum limit with a truncated SU(1,1) interferometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">Brian E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Gupta%2C+P">Prasoon Gupta</a>, <a href="/search/quant-ph?searchtype=author&query=Schmittberger%2C+B+L">Bonnie L. Schmittberger</a>, <a href="/search/quant-ph?searchtype=author&query=Horrom%2C+T">Travis Horrom</a>, <a href="/search/quant-ph?searchtype=author&query=Hermann-Avigliano%2C+C">Carla Hermann-Avigliano</a>, <a href="/search/quant-ph?searchtype=author&query=Jones%2C+K+M">Kevin M. Jones</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</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="1610.06891v1-abstract-short" style="display: inline;"> An SU(1,1) interferometer replaces the beamsplitters in a Mach-Zehnder interferometer with nonlinear interactions and offers the potential of achieving high phase sensitivity in applications with low optical powers. We present a novel variation in which the second nonlinear interaction is replaced with balanced homodyne detection. The phase-sensing quantum state is a two-mode squeezed state produc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06891v1-abstract-full').style.display = 'inline'; document.getElementById('1610.06891v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.06891v1-abstract-full" style="display: none;"> An SU(1,1) interferometer replaces the beamsplitters in a Mach-Zehnder interferometer with nonlinear interactions and offers the potential of achieving high phase sensitivity in applications with low optical powers. We present a novel variation in which the second nonlinear interaction is replaced with balanced homodyne detection. The phase-sensing quantum state is a two-mode squeezed state produced by seeded four-wave-mixing in Rb vapor. Measurements as a function of operating point show that even with $\approx35~\%$ loss this device can surpass the standard quantum limit by 4~dB. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06891v1-abstract-full').style.display = 'none'; document.getElementById('1610.06891v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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 plus Supplemental Material</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.02181">arXiv:1507.02181</a> <span> [<a href="https://arxiv.org/pdf/1507.02181">pdf</a>, <a href="https://arxiv.org/format/1507.02181">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/10.1080/09500340.2015.1071891">10.1080/09500340.2015.1071891 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multi-channel entanglement distribution using spatial multiplexing from four-wave mixing in atomic vapor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Gupta%2C+P">Prasoon Gupta</a>, <a href="/search/quant-ph?searchtype=author&query=Horrom%2C+T">Travis Horrom</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">Brian E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Glasser%2C+R">Ryan Glasser</a>, <a href="/search/quant-ph?searchtype=author&query=Lett%2C+P+D">Paul D. Lett</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="1507.02181v1-abstract-short" style="display: inline;"> Four-wave mixing in atomic vapor allows for the generation of multi-spatial-mode states of light containing many pairs of two-mode entangled vacuum beams. This in principle can be used to send independent secure keys to multiple parties simultaneously using a single light source. In our experiment, we demonstrate this spatial multiplexing of information by selecting three independent pairs of enta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02181v1-abstract-full').style.display = 'inline'; document.getElementById('1507.02181v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.02181v1-abstract-full" style="display: none;"> Four-wave mixing in atomic vapor allows for the generation of multi-spatial-mode states of light containing many pairs of two-mode entangled vacuum beams. This in principle can be used to send independent secure keys to multiple parties simultaneously using a single light source. In our experiment, we demonstrate this spatial multiplexing of information by selecting three independent pairs of entangled modes and performing continuous-variable measurements to verify the correlations between entangled partners. In this way, we generate three independent pairs of correlated random bit streams that could be used as secure keys. We then demonstrate a classical four-party secret sharing scheme as an example for how this spatially multiplexed source could be used. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.02181v1-abstract-full').style.display = 'none'; document.getElementById('1507.02181v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 July, 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">Accepted in Journal of Modern Optics, 7 pages, 3 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/1410.3891">arXiv:1410.3891</a> <span> [<a href="https://arxiv.org/pdf/1410.3891">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <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"> Accurate and robust unitary transformation of a high-dimensional quantum system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Sosa-Martinez%2C+H">H. Sosa-Martinez</a>, <a href="/search/quant-ph?searchtype=author&query=Riofr%C3%ADo%2C+C+A">C. A. Riofr铆o</a>, <a href="/search/quant-ph?searchtype=author&query=Deutsch%2C+I+H">I. H. Deutsch</a>, <a href="/search/quant-ph?searchtype=author&query=Jessen%2C+P+S">P. S. Jessen</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="1410.3891v1-abstract-short" style="display: inline;"> Quantum control in large dimensional Hilbert spaces is essential for realizing the power of quantum information processing. For closed quantum systems the relevant input/output maps are unitary transformations, and the fundamental challenge becomes how to implement these with high fidelity in the presence of experimental imperfections and decoherence. For two-level systems (qubits) most aspects of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.3891v1-abstract-full').style.display = 'inline'; document.getElementById('1410.3891v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1410.3891v1-abstract-full" style="display: none;"> Quantum control in large dimensional Hilbert spaces is essential for realizing the power of quantum information processing. For closed quantum systems the relevant input/output maps are unitary transformations, and the fundamental challenge becomes how to implement these with high fidelity in the presence of experimental imperfections and decoherence. For two-level systems (qubits) most aspects of unitary control are well understood, but for systems with Hilbert space dimension d>2 (qudits), many questions remain regarding the optimal design of control Hamiltonians and the feasibility of robust implementation. Here we show that arbitrary, randomly chosen unitary transformations can be efficiently designed and implemented in a large dimensional Hilbert space (d=16) associated with the electronic ground state of atomic 133Cs, achieving fidelities above 0.98 as measured by randomized benchmarking. Generalizing the concepts of inhomogeneous control and dynamical decoupling to d>2 systems, we further demonstrate that these qudit unitary maps can be made robust to both static and dynamic perturbations. Potential applications include improved fault-tolerance in universal quantum computation, nonclassical state preparation for high-precision metrology, implementation of quantum simulations, and the study of fundamental physics related to open quantum systems and quantum chaos. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1410.3891v1-abstract-full').style.display = 'none'; document.getElementById('1410.3891v1-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 October, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">5 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1308.4731">arXiv:1308.4731</a> <span> [<a href="https://arxiv.org/pdf/1308.4731">pdf</a>, <a href="https://arxiv.org/format/1308.4731">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.111.170502">10.1103/PhysRevLett.111.170502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum Control in the Cs 6S_{1/2} Ground Manifold Using rf and 渭w Magnetic Fields </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Smith%2C+A">A. Smith</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Sosa-Martinez%2C+H">H. Sosa-Martinez</a>, <a href="/search/quant-ph?searchtype=author&query=Riofr%C3%ADo%2C+C+A">C. A. Riofr铆o</a>, <a href="/search/quant-ph?searchtype=author&query=Deutsch%2C+I+H">I. H. Deutsch</a>, <a href="/search/quant-ph?searchtype=author&query=Jessen%2C+P+S">P. S. Jessen</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="1308.4731v1-abstract-short" style="display: inline;"> We implement arbitrary maps between pure states in the 16-dimensional Hilbert space associated with the ground electronic manifold of Cs. This is accomplished by driving atoms with phase modulated rf and 渭w fields, using modulation waveforms found via numerical optimization and designed to work robustly in the presence of imperfections. We evaluate the performance of a sample of randomly chosen st… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.4731v1-abstract-full').style.display = 'inline'; document.getElementById('1308.4731v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.4731v1-abstract-full" style="display: none;"> We implement arbitrary maps between pure states in the 16-dimensional Hilbert space associated with the ground electronic manifold of Cs. This is accomplished by driving atoms with phase modulated rf and 渭w fields, using modulation waveforms found via numerical optimization and designed to work robustly in the presence of imperfections. We evaluate the performance of a sample of randomly chosen state maps by randomized benchmarking, obtaining an average fidelity >99%. Our protocol advances state-of-the-art quantum control and has immediate applications in quantum metrology and tomography. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.4731v1-abstract-full').style.display = 'none'; document.getElementById('1308.4731v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 August, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1208.5015">arXiv:1208.5015</a> <span> [<a href="https://arxiv.org/pdf/1208.5015">pdf</a>, <a href="https://arxiv.org/format/1208.5015">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.87.030102">10.1103/PhysRevA.87.030102 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum state tomography by continuous measurement and compressed sensing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/quant-ph?searchtype=author&query=Smith%2C+A">A. Smith</a>, <a href="/search/quant-ph?searchtype=author&query=Riofr%C3%ADo%2C+C+A">C. A. Riofr铆o</a>, <a href="/search/quant-ph?searchtype=author&query=Anderson%2C+B+E">B. E. Anderson</a>, <a href="/search/quant-ph?searchtype=author&query=Sosa-Martinez%2C+H">H. Sosa-Martinez</a>, <a href="/search/quant-ph?searchtype=author&query=Deutsch%2C+I+H">I. H. Deutsch</a>, <a href="/search/quant-ph?searchtype=author&query=Jessen%2C+P+S">P. S. Jessen</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="1208.5015v2-abstract-short" style="display: inline;"> The need to perform quantum state tomography on ever larger systems has spurred a search for methods that yield good estimates from incomplete data. We study the performance of compressed sensing (CS) and least squares (LS) estimators in a fast protocol based on continuous measurement on an ensemble of cesium atomic spins. Both efficiently reconstruct nearly pure states in the 16-dimensional groun… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.5015v2-abstract-full').style.display = 'inline'; document.getElementById('1208.5015v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1208.5015v2-abstract-full" style="display: none;"> The need to perform quantum state tomography on ever larger systems has spurred a search for methods that yield good estimates from incomplete data. We study the performance of compressed sensing (CS) and least squares (LS) estimators in a fast protocol based on continuous measurement on an ensemble of cesium atomic spins. Both efficiently reconstruct nearly pure states in the 16-dimensional ground manifold, reaching average fidelities FCS = 0.92 and FLS = 0.88 using similar amounts of incomplete data. Surprisingly, the main advantage of CS in our protocol is an increased robustness to experimental imperfections. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.5015v2-abstract-full').style.display = 'none'; document.getElementById('1208.5015v2-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, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review A 87, 030102(R) (2013) </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 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