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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/2405.08840">arXiv:2405.08840</a> <span> [<a href="https://arxiv.org/pdf/2405.08840">pdf</a>, <a href="https://arxiv.org/format/2405.08840">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Femtosecond laser written waveguides in sapphire for visible light delivery </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Winkler%2C+S">Sarah Winkler</a>, <a href="/search/physics?searchtype=author&query=Krenn%2C+J+R">Joachim R. Krenn</a>, <a href="/search/physics?searchtype=author&query=Wahl%2C+J">Jakob Wahl</a>, <a href="/search/physics?searchtype=author&query=Zesar%2C+A">Alexander Zesar</a>, <a href="/search/physics?searchtype=author&query=Colombe%2C+Y">Yves Colombe</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=R%C3%B6ssler%2C+C">Clemens R枚ssler</a>, <a href="/search/physics?searchtype=author&query=Sommer%2C+C">Christian Sommer</a>, <a href="/search/physics?searchtype=author&query=Hurdax%2C+P">Philipp Hurdax</a>, <a href="/search/physics?searchtype=author&query=Lichtenegger%2C+P">Philip Lichtenegger</a>, <a href="/search/physics?searchtype=author&query=Lamprecht%2C+B">Bernhard Lamprecht</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.08840v2-abstract-short" style="display: inline;"> A promising solution for scalable integrated optics of trapped-ion quantum processors are curved waveguides guiding visible light within sapphire bulk material. To the best of our knowledge, no curved waveguides were investigated in sapphire so far, and no measurements of waveguides with visible light in undoped planar sapphire substrates were reported. Here, we demonstrate femtosecond laser writi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.08840v2-abstract-full').style.display = 'inline'; document.getElementById('2405.08840v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.08840v2-abstract-full" style="display: none;"> A promising solution for scalable integrated optics of trapped-ion quantum processors are curved waveguides guiding visible light within sapphire bulk material. To the best of our knowledge, no curved waveguides were investigated in sapphire so far, and no measurements of waveguides with visible light in undoped planar sapphire substrates were reported. Here, we demonstrate femtosecond laser writing of depressed cladding waveguides in sapphire. Laser parameters, such as pulse energy, pulse duration, and repetition rate, as well as waveguide geometry parameters, were optimized to guide 728 nm light. This resulted in single-mode waveguides with a propagation loss of 1.9(3) dB/cm. The investigation of curved waveguides showed a sharp increase in total loss for curvature radii below 15 mm. Our results demonstrate the potential of femtosecond laser writing as a powerful technique for creating integrated optical waveguides in the volume of sapphire substrates. Such waveguides could be a building block for integrated optics in trapped-ion quantum processors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.08840v2-abstract-full').style.display = 'none'; document.getElementById('2405.08840v2-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.10500">arXiv:2207.10500</a> <span> [<a href="https://arxiv.org/pdf/2207.10500">pdf</a>, <a href="https://arxiv.org/format/2207.10500">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="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Integrating a fiber cavity into a wheel trap for strong ion-cavity coupling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Teller%2C+M">Markus Teller</a>, <a href="/search/physics?searchtype=author&query=Messerer%2C+V">Viktor Messerer</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Zou%2C+Y">Yueyang Zou</a>, <a href="/search/physics?searchtype=author&query=Fioretto%2C+D+A">Dario A. Fioretto</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+M">Maria Galli</a>, <a href="/search/physics?searchtype=author&query=Holz%2C+P+C">Philip C. Holz</a>, <a href="/search/physics?searchtype=author&query=Reichel%2C+J">Jakob Reichel</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">Tracy E. Northup</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.10500v1-abstract-short" style="display: inline;"> We present an ion trap with an integrated fiber cavity, designed for strong coupling at the level of single ions and photons. The cavity is aligned to the axis of a miniature linear Paul trap, enabling simultaneous coupling of multiple ions to the cavity field. We simulate how charges on the fiber mirrors affect the trap potential, and we test these predictions with an ion trapped in the cavity. F… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10500v1-abstract-full').style.display = 'inline'; document.getElementById('2207.10500v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.10500v1-abstract-full" style="display: none;"> We present an ion trap with an integrated fiber cavity, designed for strong coupling at the level of single ions and photons. The cavity is aligned to the axis of a miniature linear Paul trap, enabling simultaneous coupling of multiple ions to the cavity field. We simulate how charges on the fiber mirrors affect the trap potential, and we test these predictions with an ion trapped in the cavity. Furthermore, we measure micromotion and heating rates in the setup. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10500v1-abstract-full').style.display = 'none'; document.getElementById('2207.10500v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.02245">arXiv:2002.02245</a> <span> [<a href="https://arxiv.org/pdf/2002.02245">pdf</a>, <a href="https://arxiv.org/format/2002.02245">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="Applied Physics">physics.app-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/10.1088/1367-2630/ab8af9">10.1088/1367-2630/ab8af9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing surface charge densities on optical fibers with a trapped ion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ong%2C+F+R">Florian R. Ong</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Jobez%2C+P">Pierre Jobez</a>, <a href="/search/physics?searchtype=author&query=Teller%2C+M">Markus Teller</a>, <a href="/search/physics?searchtype=author&query=Ames%2C+B">Ben Ames</a>, <a href="/search/physics?searchtype=author&query=Fioretto%2C+D+A">Dario A. Fioretto</a>, <a href="/search/physics?searchtype=author&query=Friebe%2C+K">Konstantin Friebe</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+M">Moonjoo Lee</a>, <a href="/search/physics?searchtype=author&query=Colombe%2C+Y">Yves Colombe</a>, <a href="/search/physics?searchtype=author&query=Blatt%2C+R">Rainer Blatt</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">Tracy E. Northup</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="2002.02245v2-abstract-short" style="display: inline;"> We describe a novel method to measure the surface charge densities on optical fibers placed in the vicinity of a trapped ion, where the ion itself acts as the probe. Surface charges distort the trapping potential, and when the fibers are displaced, the ion's equilibrium position and secular motional frequencies are altered. We measure the latter quantities for different positions of the fibers and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.02245v2-abstract-full').style.display = 'inline'; document.getElementById('2002.02245v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.02245v2-abstract-full" style="display: none;"> We describe a novel method to measure the surface charge densities on optical fibers placed in the vicinity of a trapped ion, where the ion itself acts as the probe. Surface charges distort the trapping potential, and when the fibers are displaced, the ion's equilibrium position and secular motional frequencies are altered. We measure the latter quantities for different positions of the fibers and compare these measurements to simulations in which unknown charge densities on the fibers are adjustable parameters. Values ranging from $-10$ to $+50$ e/$渭$m$^2$ were determined. Our results will benefit the design and simulation of miniaturized experimental systems combining ion traps and integrated optics, for example, in the fields of quantum computation, communication and metrology. Furthermore, our method can be applied to any setup in which a dielectric element can be displaced relative to a trapped charge-sensitive particle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.02245v2-abstract-full').style.display = 'none'; document.getElementById('2002.02245v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 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">21 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.07594">arXiv:1907.07594</a> <span> [<a href="https://arxiv.org/pdf/1907.07594">pdf</a>, <a href="https://arxiv.org/format/1907.07594">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="Applied Physics">physics.app-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/PhysRevApplied.12.044052">10.1103/PhysRevApplied.12.044052 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Microelectromechanical-System-Based Design of a High-Finesse Fiber Cavity Integrated with an Ion Trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lee%2C+M">Moonjoo Lee</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+M">Minjae Lee</a>, <a href="/search/physics?searchtype=author&query=Hong%2C+S">Seokjun Hong</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Kwon%2C+Y">Yeong-Dae Kwon</a>, <a href="/search/physics?searchtype=author&query=Kim%2C+T">Taehyun Kim</a>, <a href="/search/physics?searchtype=author&query=Colombe%2C+Y">Yves Colombe</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">Tracy E. Northup</a>, <a href="/search/physics?searchtype=author&query=Cho%2C+D+%22">Dong-Il "Dan" Cho</a>, <a href="/search/physics?searchtype=author&query=Blatt%2C+R">Rainer Blatt</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="1907.07594v3-abstract-short" style="display: inline;"> We present a numerical study of a MEMS-based design of a fiber cavity integrated with an ion trap system. Each fiber mirror is supported by a microactuator that controls the mirror's position in three dimensions. The mechanical stability is investigated by a feasibility analysis showing that the actuator offers a stable support of the fiber. The actuators move the fibers' positions continuously wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.07594v3-abstract-full').style.display = 'inline'; document.getElementById('1907.07594v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.07594v3-abstract-full" style="display: none;"> We present a numerical study of a MEMS-based design of a fiber cavity integrated with an ion trap system. Each fiber mirror is supported by a microactuator that controls the mirror's position in three dimensions. The mechanical stability is investigated by a feasibility analysis showing that the actuator offers a stable support of the fiber. The actuators move the fibers' positions continuously with a stroke of more than 10 $渭$m, with mechanical resonance frequencies on the order of kHz. A calculation of the trapping potential shows that a separation between ion and fiber consistent with strong ion-cavity coupling is feasible. Our miniaturized ion-photon interface constitutes a viable approach to integrated hardware for quantum information. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.07594v3-abstract-full').style.display = 'none'; document.getElementById('1907.07594v3-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> 27 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </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, 11 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Applied 12, 044052 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.13340">arXiv:1810.13340</a> <span> [<a href="https://arxiv.org/pdf/1810.13340">pdf</a>, <a href="https://arxiv.org/format/1810.13340">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="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/10.1103/PhysRevLett.122.153603">10.1103/PhysRevLett.122.153603 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ion-based nondestructive sensor for cavity photon numbers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lee%2C+M">Moonjoo Lee</a>, <a href="/search/physics?searchtype=author&query=Friebe%2C+K">Konstantin Friebe</a>, <a href="/search/physics?searchtype=author&query=Fioretto%2C+D+A">Dario A. Fioretto</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Ong%2C+F+R">Florian R. Ong</a>, <a href="/search/physics?searchtype=author&query=Plankensteiner%2C+D">David Plankensteiner</a>, <a href="/search/physics?searchtype=author&query=Torggler%2C+V">Valentin Torggler</a>, <a href="/search/physics?searchtype=author&query=Ritsch%2C+H">Helmut Ritsch</a>, <a href="/search/physics?searchtype=author&query=Blatt%2C+R">Rainer Blatt</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">Tracy E. Northup</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1810.13340v1-abstract-short" style="display: inline;"> We dispersively couple a single trapped ion to an optical cavity to extract information about the cavity photon-number distribution in a nondestructive way. The photon-number-dependent AC-Stark shift experienced by the ion is measured via Ramsey spectroscopy. We use these measurements first to obtain the ion-cavity interaction strength. Next, we reconstruct the cavity photon-number distribution fo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.13340v1-abstract-full').style.display = 'inline'; document.getElementById('1810.13340v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.13340v1-abstract-full" style="display: none;"> We dispersively couple a single trapped ion to an optical cavity to extract information about the cavity photon-number distribution in a nondestructive way. The photon-number-dependent AC-Stark shift experienced by the ion is measured via Ramsey spectroscopy. We use these measurements first to obtain the ion-cavity interaction strength. Next, we reconstruct the cavity photon-number distribution for coherent states and for a state with mixed thermal-coherent statistics, finding overlaps above 99% with the calibrated states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.13340v1-abstract-full').style.display = 'none'; document.getElementById('1810.13340v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Manuscript: 6 pages, 4 figures. Supplemental Material: 5 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 122, 153603 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.04791">arXiv:1603.04791</a> <span> [<a href="https://arxiv.org/pdf/1603.04791">pdf</a>, <a href="https://arxiv.org/format/1603.04791">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Millimeter-long Fiber Fabry-Perot cavities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ott%2C+K">Konstantin Ott</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+S">Sebastien Garcia</a>, <a href="/search/physics?searchtype=author&query=Kohlhaas%2C+R">Ralf Kohlhaas</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Rosenbusch%2C+P">Peter Rosenbusch</a>, <a href="/search/physics?searchtype=author&query=Long%2C+R">Romain Long</a>, <a href="/search/physics?searchtype=author&query=Reichel%2C+J">Jakob Reichel</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="1603.04791v1-abstract-short" style="display: inline;"> We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5mm without significant deterioration of the finesse. This is achieved by using a laser dot machining technique to shape spherical mirrors with ultralow roughness and employing single-mode fibers with large mode area for good mode matching to the cavity. Additionally, in contra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.04791v1-abstract-full').style.display = 'inline'; document.getElementById('1603.04791v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.04791v1-abstract-full" style="display: none;"> We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5mm without significant deterioration of the finesse. This is achieved by using a laser dot machining technique to shape spherical mirrors with ultralow roughness and employing single-mode fibers with large mode area for good mode matching to the cavity. Additionally, in contrast to previous FFPs, these cavities can be used over an octave-spanning frequency range with adequate coatings. We also show directly that shape deviations caused by the fiber's index profile lead to a finesse decrease as observed in earlier attempts to build long FFP cavities, and show a way to overcome this problem. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.04791v1-abstract-full').style.display = 'none'; document.getElementById('1603.04791v1-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, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1408.6266">arXiv:1408.6266</a> <span> [<a href="https://arxiv.org/pdf/1408.6266">pdf</a>, <a href="https://arxiv.org/format/1408.6266">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.114.023602">10.1103/PhysRevLett.114.023602 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enhanced Quantum Interface with Collective Ion-Cavity Coupling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Casabone%2C+B">B. Casabone</a>, <a href="/search/physics?searchtype=author&query=Friebe%2C+K">K. Friebe</a>, <a href="/search/physics?searchtype=author&query=Brandst%C3%A4tter%2C+B">B. Brandst盲tter</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">K. Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Blatt%2C+R">R. Blatt</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">T. E. Northup</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="1408.6266v2-abstract-short" style="display: inline;"> We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of the ions with the cavity mode, that is, whether the emission of a single photon into the cavity is suppressed or enhanced. By adjusting this phase, we tune the ion--cavity system from sub- to superradiance. We then encod… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.6266v2-abstract-full').style.display = 'inline'; document.getElementById('1408.6266v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1408.6266v2-abstract-full" style="display: none;"> We prepare a maximally entangled state of two ions and couple both ions to the mode of an optical cavity. The phase of the entangled state determines the collective interaction of the ions with the cavity mode, that is, whether the emission of a single photon into the cavity is suppressed or enhanced. By adjusting this phase, we tune the ion--cavity system from sub- to superradiance. We then encode a single qubit in the two-ion superradiant state and show that this encoding enhances the transfer of quantum information onto a photon. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1408.6266v2-abstract-full').style.display = 'none'; document.getElementById('1408.6266v2-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 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 114.2 (2015): 023602 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.6961">arXiv:1311.6961</a> <span> [<a href="https://arxiv.org/pdf/1311.6961">pdf</a>, <a href="https://arxiv.org/ps/1311.6961">ps</a>, <a href="https://arxiv.org/format/1311.6961">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div 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/10.1063/1.4838696">10.1063/1.4838696 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Integrated Fiber-Mirror Ion Trap for Strong Ion-Cavity Coupling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brandst%C3%A4tter%2C+B">Birgit Brandst盲tter</a>, <a href="/search/physics?searchtype=author&query=McClung%2C+A">Andrew McClung</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%BCppert%2C+K">Klemens Sch眉ppert</a>, <a href="/search/physics?searchtype=author&query=Casabone%2C+B">Bernardo Casabone</a>, <a href="/search/physics?searchtype=author&query=Friebe%2C+K">Konstantin Friebe</a>, <a href="/search/physics?searchtype=author&query=Stute%2C+A">Andreas Stute</a>, <a href="/search/physics?searchtype=author&query=Schmidt%2C+P+O">Piet O. Schmidt</a>, <a href="/search/physics?searchtype=author&query=Deutsch%2C+C">Christian Deutsch</a>, <a href="/search/physics?searchtype=author&query=Reichel%2C+J">Jakob Reichel</a>, <a href="/search/physics?searchtype=author&query=Blatt%2C+R">Rainer Blatt</a>, <a href="/search/physics?searchtype=author&query=Northup%2C+T+E">Tracy E. Northup</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="1311.6961v1-abstract-short" style="display: inline;"> We present and characterize fiber mirrors and a miniaturized ion-trap design developed to integrate a fiber-based Fabry-Perot cavity (FFPC) with a linear Paul trap for use in cavity-QED experiments with trapped ions. Our fiber-mirror fabrication process not only enables the construction of FFPCs with small mode volumes, but also allows us to minimize the influence of the dielectric fiber mirrors o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.6961v1-abstract-full').style.display = 'inline'; document.getElementById('1311.6961v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.6961v1-abstract-full" style="display: none;"> We present and characterize fiber mirrors and a miniaturized ion-trap design developed to integrate a fiber-based Fabry-Perot cavity (FFPC) with a linear Paul trap for use in cavity-QED experiments with trapped ions. Our fiber-mirror fabrication process not only enables the construction of FFPCs with small mode volumes, but also allows us to minimize the influence of the dielectric fiber mirrors on the trapped-ion pseudopotential. We discuss the effect of clipping losses for long FFPCs and the effect of angular and lateral displacements on the coupling efficiencies between cavity and fiber. Optical profilometry allows us to determine the radii of curvature and ellipticities of the fiber mirrors. From finesse measurements we infer a single-atom cooperativity of up to $12$ for FFPCs longer than $200 渭$m in length; comparison to cavities constructed with reference substrate mirrors produced in the same coating run indicates that our FFPCs have similar scattering losses. We discuss experiments to anneal fiber mirrors and explore the influence of the atmosphere under which annealing occurs on coating losses, finding that annealing under vacuum increases the losses for our reference substrate mirrors. Our unique linear Paul trap design provides clearance for such a cavity and is miniaturized to shield trapped ions from the dielectric fiber mirrors. We numerically calculate the trap potential in the absence of fibers. In the experiment additional electrodes can be used to compensate distortions of the potential due to the fibers. Home-built fiber feedthroughs connect the FFPC to external optics, and an integrated nanopositioning system affords the possibility of retracting or realigning the cavity without breaking vacuum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.6961v1-abstract-full').style.display = 'none'; document.getElementById('1311.6961v1-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> 27 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">The following article has been accepted by Review of Scientific Instruments. 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