1
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Wang Y, Wu YK, Jiang Y, Cai ML, Li BW, Mei QX, Qi BX, Zhou ZC, Duan LM. Realizing Synthetic Dimensions and Artificial Magnetic Flux in a Trapped-Ion Quantum Simulator. PHYSICAL REVIEW LETTERS 2024; 132:130601. [PMID: 38613306 DOI: 10.1103/physrevlett.132.130601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 12/12/2023] [Accepted: 02/29/2024] [Indexed: 04/14/2024]
Abstract
Synthetic dimension is a potent tool in quantum simulation of topological phases of matter. Here we propose and demonstrate a scheme to simulate an anisotropic Harper-Hofstadter model with controllable magnetic flux on a two-leg ladder using the spin and motional states of a single trapped ion. We verify the successful simulation of this model by comparing the measured dynamics with theoretical predictions under various coupling strength and magnetic flux, and we observe the chiral motion of wave packets on the ladder as evidence of the topological chiral edge modes. We develop a quench path to adiabatically prepare the ground states for varying magnetic flux and coupling strength, and we measure the chiral current on the ladder for the prepared ground states, which allows us to probe the quantum phase transition between the Meissner phase and the vortex phase. Our work demonstrates the trapped ion as a powerful quantum simulation platform for topological quantum matter.
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Affiliation(s)
- Y Wang
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Y-K Wu
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
- Hefei National Laboratory, Hefei 230088, People's Republic of China
| | - Y Jiang
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - M-L Cai
- HYQ Co., Ltd., Beijing 100176, People's Republic of China
| | - B-W Li
- HYQ Co., Ltd., Beijing 100176, People's Republic of China
| | - Q-X Mei
- HYQ Co., Ltd., Beijing 100176, People's Republic of China
| | - B-X Qi
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Z-C Zhou
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
- Hefei National Laboratory, Hefei 230088, People's Republic of China
| | - L-M Duan
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
- Hefei National Laboratory, Hefei 230088, People's Republic of China
- New Cornerstone Science Laboratory, Beijing 100084, People's Republic of China
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2
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Jain S, Sägesser T, Hrmo P, Torkzaban C, Stadler M, Oswald R, Axline C, Bautista-Salvador A, Ospelkaus C, Kienzler D, Home J. Penning micro-trap for quantum computing. Nature 2024; 627:510-514. [PMID: 38480890 PMCID: PMC10954548 DOI: 10.1038/s41586-024-07111-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/24/2024] [Indexed: 03/18/2024]
Abstract
Trapped ions in radio-frequency traps are among the leading approaches for realizing quantum computers, because of high-fidelity quantum gates and long coherence times1-3. However, the use of radio-frequencies presents several challenges to scaling, including requiring compatibility of chips with high voltages4, managing power dissipation5 and restricting transport and placement of ions6. Here we realize a micro-fabricated Penning ion trap that removes these restrictions by replacing the radio-frequency field with a 3 T magnetic field. We demonstrate full quantum control of an ion in this setting, as well as the ability to transport the ion arbitrarily in the trapping plane above the chip. This unique feature of the Penning micro-trap approach opens up a modification of the quantum charge-coupled device architecture with improved connectivity and flexibility, facilitating the realization of large-scale trapped-ion quantum computing, quantum simulation and quantum sensing.
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Affiliation(s)
- Shreyans Jain
- Department of Physics, ETH Zürich, Zurich, Switzerland.
- Quantum Center, ETH Zürich, Zurich, Switzerland.
| | - Tobias Sägesser
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
| | - Pavel Hrmo
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
| | | | - Martin Stadler
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
| | - Robin Oswald
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
| | - Chris Axline
- Department of Physics, ETH Zürich, Zurich, Switzerland
| | - Amado Bautista-Salvador
- Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany
- Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
| | - Christian Ospelkaus
- Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany
- Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
| | - Daniel Kienzler
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
| | - Jonathan Home
- Department of Physics, ETH Zürich, Zurich, Switzerland
- Quantum Center, ETH Zürich, Zurich, Switzerland
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3
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Fallek SD, Sandhu VS, McGill RA, Gray JM, Tinkey HN, Clark CR, Brown KR. Rapid exchange cooling with trapped ions. Nat Commun 2024; 15:1089. [PMID: 38316766 DOI: 10.1038/s41467-024-45232-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 01/18/2024] [Indexed: 02/07/2024] Open
Abstract
The trapped-ion quantum charge-coupled device (QCCD) architecture is a leading candidate for advanced quantum information processing. In current QCCD implementations, imperfect ion transport and anomalous heating can excite ion motion during a calculation. To counteract this, intermediate cooling is necessary to maintain high-fidelity gate performance. Cooling the computational ions sympathetically with ions of another species, a commonly employed strategy, creates a significant runtime bottleneck. Here, we demonstrate a different approach we call exchange cooling. Unlike sympathetic cooling, exchange cooling does not require trapping two different atomic species. The protocol introduces a bank of "coolant" ions which are repeatedly laser cooled. A computational ion can then be cooled by transporting a coolant ion into its proximity. We test this concept experimentally with two 40Ca+ ions, executing the necessary transport in 107 μs, an order of magnitude faster than typical sympathetic cooling durations. We remove over 96%, and as many as 102(5) quanta, of axial motional energy from the computational ion. We verify that re-cooling the coolant ion does not decohere the computational ion. This approach validates the feasibility of a single-species QCCD processor, capable of fast quantum simulation and computation.
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Affiliation(s)
| | | | - Ryan A McGill
- Georgia Tech Research Institute, Atlanta, 30332, GA, USA
| | - John M Gray
- Georgia Tech Research Institute, Atlanta, 30332, GA, USA
| | - Holly N Tinkey
- Georgia Tech Research Institute, Atlanta, 30332, GA, USA
| | - Craig R Clark
- Georgia Tech Research Institute, Atlanta, 30332, GA, USA
| | - Kenton R Brown
- Georgia Tech Research Institute, Atlanta, 30332, GA, USA
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4
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Jiang WL, Peng Z, Huang B, Zhao XL, Sun D, Shi X, Yang HB. TEMPO Radical-Functionalized Supramolecular Coordination Complexes with Controllable Spin–Spin Interactions. J Am Chem Soc 2020; 143:433-441. [DOI: 10.1021/jacs.0c11738] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Wei-Ling Jiang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Zhiyong Peng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Bin Huang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Xiao-Li Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Di Sun
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China
| | - Xueliang Shi
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Hai-Bo Yang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
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5
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Kiefer P, Hakelberg F, Wittemer M, Bermúdez A, Porras D, Warring U, Schaetz T. Floquet-Engineered Vibrational Dynamics in a Two-Dimensional Array of Trapped Ions. PHYSICAL REVIEW LETTERS 2019; 123:213605. [PMID: 31809155 DOI: 10.1103/physrevlett.123.213605] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate Floquet engineering in a basic yet scalable 2D architecture of individually trapped and controlled ions. Local parametric modulations of detuned trapping potentials steer the strength of long-range interion couplings and the related Peierls phase of the motional state. In our proof of principle, we initialize large coherent states and tune modulation parameters to control trajectories, directions, and interferences of the phonon flow. Our findings open a new pathway for future Floquet-based trapped-ion quantum simulators targeting correlated topological phenomena and dynamical gauge fields.
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Affiliation(s)
- Philip Kiefer
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Frederick Hakelberg
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Matthias Wittemer
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Alejandro Bermúdez
- Departamento de Física Teórica, Universidad Complutense, 28040 Madrid, Spain
| | - Diego Porras
- Instituto de Física Fundamental IFF-CSIC, Calle Serrano 113b, 28006 Madrid, Spain
| | - Ulrich Warring
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Tobias Schaetz
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
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6
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Hakelberg F, Kiefer P, Wittemer M, Warring U, Schaetz T. Interference in a Prototype of a Two-Dimensional Ion Trap Array Quantum Simulator. PHYSICAL REVIEW LETTERS 2019; 123:100504. [PMID: 31573283 DOI: 10.1103/physrevlett.123.100504] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Indexed: 06/10/2023]
Abstract
Trapped ions are a promising platform for envisioned quantum simulators, with outstanding results in one-dimensional ion crystals. However, theory requires not only interactions at long range, but also higher dimensionality. We operate a basic triangular array of three individually trapped ions based on scalable microfabrication technology. We demonstrate coherent coupling, tunable in real time and enabling interference in 2D, an essential building block for a reconfigurable quantum simulator. Mitigating motional heating will permit accessing the quantum regime and 2D experimental quantum simulations.
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Affiliation(s)
- Frederick Hakelberg
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Philip Kiefer
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Matthias Wittemer
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Ulrich Warring
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
| | - Tobias Schaetz
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany
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7
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McCormick KC, Keller J, Burd SC, Wineland DJ, Wilson AC, Leibfried D. Quantum-enhanced sensing of a single-ion mechanical oscillator. Nature 2019; 572:86-90. [PMID: 31332388 PMCID: PMC6986265 DOI: 10.1038/s41586-019-1421-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 06/05/2019] [Indexed: 11/08/2022]
Abstract
Special quantum states are used in metrology to achieve sensitivities below the limits established by classically behaving states1,2. In bosonic interferometers, squeezed states3, number states4,5 and 'Schrödinger cat' states5 have been implemented on various platforms and have demonstrated improved measurement precision over interferometers using coherent states6,7. Another metrologically useful state is an equal superposition of two eigenstates with maximally different energies; this state ideally reaches the full interferometric sensitivity allowed by quantum mechanics8,9. Here we demonstrate the enhanced sensitivity of these quantum states in the case of a harmonic oscillator. We extend an existing experimental technique10 to create number states of order up to n = 100 and to generate superpositions of a harmonic oscillator ground state and a number state of the form [Formula: see text] with n up to 18 in the motion of a single trapped ion. Although experimental imperfections prevent us from reaching the ideal Heisenberg limit, we observe enhanced sensitivity to changes in the frequency of the mechanical oscillator. This sensitivity initially increases linearly with n and reaches a maximum at n = 12, where we observe a metrological enhancement of 6.4(4) decibels (the uncertainty is one standard deviation of the mean) compared to an ideal measurement on a coherent state with the same average occupation number. Such measurements should provide improved characterization of motional decoherence, which is an important source of error in quantum information processing with trapped ions11,12. It should also be possible to use the quantum advantage from number-state superpositions to achieve precision measurements in other harmonic oscillator systems.
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Affiliation(s)
- Katherine C McCormick
- National Institute of Standards and Technology, Boulder, CO, USA.
- Department of Physics, University of Colorado, Boulder, CO, USA.
| | - Jonas Keller
- National Institute of Standards and Technology, Boulder, CO, USA
| | - Shaun C Burd
- National Institute of Standards and Technology, Boulder, CO, USA
- Department of Physics, University of Colorado, Boulder, CO, USA
| | - David J Wineland
- National Institute of Standards and Technology, Boulder, CO, USA
- Department of Physics, University of Colorado, Boulder, CO, USA
- Department of Physics, University of Oregon, Eugene, OR, USA
| | - Andrew C Wilson
- National Institute of Standards and Technology, Boulder, CO, USA
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8
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Shyshlov D, Babikov D. Computational study of cold ions trapped in a double-well potential. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1559956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Dmitri Babikov
- Chemistry Department, Marquette University, Milwaukee, USA
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9
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Boldin IA, Kraft A, Wunderlich C. Measuring Anomalous Heating in a Planar Ion Trap with Variable Ion-Surface Separation. PHYSICAL REVIEW LETTERS 2018; 120:023201. [PMID: 29376708 DOI: 10.1103/physrevlett.120.023201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Indexed: 06/07/2023]
Abstract
Cold ions trapped in the vicinity of conductive surfaces experience heating of their oscillatory motion. Typically, the rate of this heating is orders of magnitude larger than expected from electric field fluctuations due to thermal motion of electrons in the conductors. This effect, known as anomalous heating, is not fully understood. One of the open questions is the heating rate's dependence on the ion-electrode separation. We present a direct measurement of this dependence in an ion trap of simple planar geometry. The heating rates are determined by taking images of a single ^{172}Yb^{+} ion's resonance fluorescence after a variable heating time and deducing the trapped ion's temperature from measuring its average oscillation amplitude. Assuming a power law for the heating rate versus ion-surface separation dependence, an exponent of -3.79±0.12 is measured.
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Affiliation(s)
- Ivan A Boldin
- Department Physik, Naturwissenschäftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
| | - Alexander Kraft
- Department Physik, Naturwissenschäftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
| | - Christof Wunderlich
- Department Physik, Naturwissenschäftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
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10
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Bai CH, Wang DY, Wang HF, Zhu AD, Zhang S. Classical-to-quantum transition behavior between two oscillators separated in space under the action of optomechanical interaction. Sci Rep 2017; 7:2545. [PMID: 28566715 PMCID: PMC5451418 DOI: 10.1038/s41598-017-02779-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 04/21/2017] [Indexed: 11/12/2022] Open
Abstract
We propose a scheme to show that the system consisting of two macroscopic oscillators separated in space which are coupled through Coulomb interaction displays the classical-to-quantum transition behavior under the action of optomechanical coupling interaction. Once the optomechanical coupling interaction disappears, the entanglement between the two separated oscillators disappears accordingly and the system will return to classical world even though there exists sufficiently strong Coulomb coupling between the oscillators. In addition, resorting to the squeezing of the cavity field generated by an optical parametric amplifier inside the cavity, we discuss the effect of squeezed light driving on this classical-to-quantum transition behavior instead of injecting the squeezed field directly. The results of numerical simulation show that the present scheme is feasible and practical and has stronger robustness against the environment temperature compared with previous schemes in current experimentally feasible regimes. The scheme might possibly help us to further clarify and grasp the classical-quantum boundary.
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Affiliation(s)
- Cheng-Hua Bai
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, China
| | - Dong-Yang Wang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, China
| | - Hong-Fu Wang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, China.
| | - Ai-Dong Zhu
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, China
| | - Shou Zhang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin, 133002, China
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11
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Slichter DH, Verma VB, Leibfried D, Mirin RP, Nam SW, Wineland DJ. UV-sensitive superconducting nanowire single photon detectors for integration in an ion trap. OPTICS EXPRESS 2017; 25:8705-8720. [PMID: 28437948 DOI: 10.1364/oe.25.008705] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We demonstrate superconducting nanowire single photon detectors with 76 ± 4% system detection efficiency at a wavelength of 315 nm and an operating temperature of 3.2 K, with a background count rate below 1 count per second at saturated detection efficiency. We propose integrating these detectors into planar surface electrode radio-frequency Paul traps for use in trapped ion quantum information processing. We operate detectors integrated into test ion trap structures at 3.8 K both with and without typical radio-frequency trapping electric fields. The trapping fields reduce system detection efficiency by 9%, but do not increase background count rates.
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12
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Keil M, Amit O, Zhou S, Groswasser D, Japha Y, Folman R. Fifteen years of cold matter on the atom chip: promise, realizations, and prospects. JOURNAL OF MODERN OPTICS 2016; 63:1840-1885. [PMID: 27499585 PMCID: PMC4960518 DOI: 10.1080/09500340.2016.1178820] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 03/22/2016] [Indexed: 05/30/2023]
Abstract
Here we review the field of atom chips in the context of Bose-Einstein Condensates (BEC) as well as cold matter in general. Twenty years after the first realization of the BEC and 15 years after the realization of the atom chip, the latter has been found to enable extraordinary feats: from producing BECs at a rate of several per second, through the realization of matter-wave interferometry, and all the way to novel probing of surfaces and new forces. In addition, technological applications are also being intensively pursued. This review will describe these developments and more, including new ideas which have not yet been realized.
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Affiliation(s)
- Mark Keil
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Omer Amit
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Shuyu Zhou
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - David Groswasser
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Yonathan Japha
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
| | - Ron Folman
- Department of Physics, Ben-Gurion University of the Negev, Be’er Sheva, Israel
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13
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Bai CH, Wang DY, Wang HF, Zhu AD, Zhang S. Robust entanglement between a movable mirror and atomic ensemble and entanglement transfer in coupled optomechanical system. Sci Rep 2016; 6:33404. [PMID: 27624534 PMCID: PMC5022063 DOI: 10.1038/srep33404] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 08/16/2016] [Indexed: 11/23/2022] Open
Abstract
We propose a scheme for the creation of robust entanglement between a movable mirror and atomic ensemble at the macroscopic level in coupled optomechanical system. We numerically simulate the degree of entanglement of the bipartite macroscopic entanglement and show that it depends on the coupling strength between the cavities and is robust with respect to the certain environment temperature. Inspiringly and surprisingly, according to the reported relation between the mechanical damping rate and the mechanical frequency of the movable mirror, the numerical simulation result shows that such bipartite macroscopic entanglement persists for environment temperature up to 170 K, which breaks the liquid nitrogen cooling and liquid helium cooling and largely lowers down the experiment cost. We also investigate the entanglement transfer based on this coupled system. The scheme can be used for the realization of quantum memories for continuous variable quantum information processing and quantum-limited displacement measurements.
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Affiliation(s)
- Cheng-Hua Bai
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China
| | - Dong-Yang Wang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China
| | - Hong-Fu Wang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China
| | - Ai-Dong Zhu
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China
| | - Shou Zhang
- Department of Physics, College of Science, Yanbian University, Yanji, Jilin 133002, China
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14
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Wang Y, Kumar A, Wu TY, Weiss DS. Single-qubit gates based on targeted phase shifts in a 3D neutral atom array. Science 2016; 352:1562-5. [DOI: 10.1126/science.aaf2581] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 05/10/2016] [Indexed: 11/02/2022]
Affiliation(s)
- Yang Wang
- Department of Physics, Pennsylvania State University, University Park, PA, USA
| | - Aishwarya Kumar
- Department of Physics, Pennsylvania State University, University Park, PA, USA
| | - Tsung-Yao Wu
- Department of Physics, Pennsylvania State University, University Park, PA, USA
| | - David S. Weiss
- Department of Physics, Pennsylvania State University, University Park, PA, USA
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15
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Mielenz M, Kalis H, Wittemer M, Hakelberg F, Warring U, Schmied R, Blain M, Maunz P, Moehring DL, Leibfried D, Schaetz T. Arrays of individually controlled ions suitable for two-dimensional quantum simulations. Nat Commun 2016; 7:ncomms11839. [PMID: 27291425 PMCID: PMC4909988 DOI: 10.1038/ncomms11839] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 05/05/2016] [Indexed: 11/10/2022] Open
Abstract
A precisely controlled quantum system may reveal a fundamental understanding of another, less accessible system of interest. A universal quantum computer is currently out of reach, but an analogue quantum simulator that makes relevant observables, interactions and states of a quantum model accessible could permit insight into complex dynamics. Several platforms have been suggested and proof-of-principle experiments have been conducted. Here, we operate two-dimensional arrays of three trapped ions in individually controlled harmonic wells forming equilateral triangles with side lengths 40 and 80 μm. In our approach, which is scalable to arbitrary two-dimensional lattices, we demonstrate individual control of the electronic and motional degrees of freedom, preparation of a fiducial initial state with ion motion close to the ground state, as well as a tuning of couplings between ions within experimental sequences. Our work paves the way towards a quantum simulator of two-dimensional systems designed at will.
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Affiliation(s)
- Manuel Mielenz
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
| | - Henning Kalis
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
| | - Matthias Wittemer
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
| | - Frederick Hakelberg
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
| | - Ulrich Warring
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
| | - Roman Schmied
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland
| | - Matthew Blain
- Sandia National Laboratories, PO Box 5800 Albuquerque, New Mexico 87185-1082, USA
| | - Peter Maunz
- Sandia National Laboratories, PO Box 5800 Albuquerque, New Mexico 87185-1082, USA
| | - David L. Moehring
- Sandia National Laboratories, PO Box 5800 Albuquerque, New Mexico 87185-1082, USA
| | - Dietrich Leibfried
- Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA
| | - Tobias Schaetz
- Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, Freiburg 79104, Germany
- Albert-Ludwigs-Universität Freiburg, Freiburg Institute for Advanced Studies, Albertstr. 19, 79104 Freiburg, Germany
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Wang R, Zhang C, Zhang B, Liu Y, Wang X, Xiao M. Magnetic dipolar interaction between correlated triplets created by singlet fission in tetracene crystals. Nat Commun 2015; 6:8602. [PMID: 26456368 PMCID: PMC4633952 DOI: 10.1038/ncomms9602] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 09/09/2015] [Indexed: 01/15/2023] Open
Abstract
Singlet fission can potentially break the Shockley–Queisser efficiency limit in single-junction solar cells by splitting one photoexcited singlet exciton (S1) into two triplets (2T1) in organic semiconductors. A dark multiexciton state has been proposed as the intermediate connecting S1 to 2T1. However, the exact nature of this multiexciton state, especially how the doubly excited triplets interact, remains elusive. Here we report a quantitative study on the magnetic dipolar interaction between singlet-fission-induced correlated triplets in tetracene crystals by monitoring quantum beats relevant to the multiexciton sublevels at room temperature. The resonances of multiexciton sublevels approached by tuning an external magnetic field are observed to be avoided, which agrees well with the theoretical predictions considering a magnetic dipolar interaction of ∼0.008 GHz. Our work quantifies the magnetic dipolar interaction in certain organic materials and marks an important step towards understanding the underlying physics of the multiexciton state in singlet fission. The exact mechanism of singlet fission remains unresolved. Here, Wang et al. report a quantitative measurement of the interaction between singlet-fission-induced correlated triplets in tetracene crystals with quantum beat spectroscopy, indicating the role played by exciton delocalization in singlet fission.
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Affiliation(s)
- Rui Wang
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
| | - Chunfeng Zhang
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.,Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Bo Zhang
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.,Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yunlong Liu
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.,Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaoyong Wang
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Min Xiao
- National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.,Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.,Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
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