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One step to generate quantum controlled phase-shift gate using a trapped ion

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Chinese Physics B 2008年第5期17卷 1593-1596页

作者：张世军马驰张文海叶柳 School of Physics & Material Science Anhui University Department of Physics &Electronic Engineering Hefei Teachers College

This paper presents a very simple scheme for generating quantum controlled phase-shift gate with only one step by using the two vibrational modes of a trapped ion as the two qubits. The scheme couples two vibration de... 详细信息

关键词： one step controlled phase-shift gate trapped ion

Scheme for teleportation of unknown states of trapped ion

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Chinese Physics B 2008年第2期17卷 451-455页

作者：陈美锋马宋设 Department of Electronic Science and Applied Physics Fuzhou University

A scheme is presented for teleporting an unknown state in a trapped ion system. The scheme only requires a single laser beam. It allows the trap to be in any state with a few phonons, e.g. a thermal motion. Furthermore, it works in the regime, where the Rabi frequency of the laser is on the order of the trap frequency. Thus, the teleportation speed is greatly increased, which is important for decreasing the decoherence effect. This idea can also be used to teleport an unknown ionic entangled state.

关键词： teleportation trapped ion Rabi frequency

Squeezing properties of a trapped ion in the running-wave laser beyond the Lamb-Dicke limit

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Chinese Physics B 2007年第6期16卷 1549-1553页

作者：潘长宁方卯发郑小娟胡要花 College of Physics and Information Science Hunan Normal University Changsha 410081 China

Beyond the Lamb-Dicke limit, this paper investigates the squeezing properties of the trapped ion in the travelling- wave laser. It shows that the squeezing properties of the trapped ion in the travelling-wave laser ar... 详细信息

关键词： squeezing properties trapped ion travelling-wave laser beyond Lamb-Dicke limit

Position—dependent dynamics of a trapped ion in a standing wave laser

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Chinese Physics B 2002年第10期11卷 1028-1032页

作者：方卯发 DepartmentofPhysics HunanNormalUniversityChangsha410081China

We have investigated the position-dependent dynamics of a trapped ion in a standing wave laser by transforming it to the Jaynes-Cummings-type system under the Lamb-Dicke limit. A variety of novel phenomena are exhibited,e.g. periodic collapse and revival features and long-time scaled revivals of the ionic inversion, depending on its position in the standing wave. Our result provides a way of producing a system equivalent to the two-photon Jaynes-Cummings model in the trapped ion system, with its exact periodicities.

关键词： position-dependent dynamics trapped ion collapse and revival

Measurement of the decoherence of a mesoscopic superposition of motional states of a trapped ion

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Chinese Physics B 2004年第10期13卷 1707-1710页

作者：郑仕标 DepartmentofElectronicScienceandAppliedPhysics FuzhouUniversityFuzhou350002China

We propose a scheme to observe the decoherence of a mesoscopic superposition of two coherent states in the motion of a trapped ion. In the scheme the ion is excited by two perpendicular lasers tuned to the ion transition. The decoherence is revealed by the decrease of the correlation between two successive measurements of the internal state of the ion after relevant laser-ion interaction.

关键词： decoherence mesoscopic superposition trapped ion

Generation of motional Fock states of a trapped ion in the mediate-excitation regime

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Chinese Physics B 2004年第7期13卷 1039-1041页

作者：郑仕标 DepartmentofElectronicScienceandAppliedPhysics FuzhouUniversityFuzhou350002China

We propose a scheme to prepare Fock states for the vibrational motion of a trapped ion. Unlike previous schemes,the present scheme works in the mediate-excitation regime, in which the corresponding Rabi frequency is equal to the trap frequency. Thus, the required time is greatly shortened, which is important in view of decoherence.

关键词： Fock state trapped ion mediate-excitation regime

Experimentally realizing efficient quantum control with reinforcement learning

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 13-20页

作者： Ming-Zhong Ai Yongcheng Ding Yue Ban JoséDMartín-Guerrero Jorge Casanova Jin-Ming Cui Yun-Feng Huang Xi Chen Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China International Center of Quantum Artifcial Intelligence for Science and Technology(Qu Artist)and Department of Physics Shanghai UniversityShanghai 200444China Department of Physical Chemistry University of the Basque Country UPV/EHUBilbao 48080Spai School of Materials Science and Engineering Shanghai UniversityShanghai 200444China IDAL Electronic Engineering DepartmentUniversity of ValenciaValencia 46100Spain IKERBASQUE Basque Foundation for ScienceBilbao 48009Spain

We experimentally investigate deep reinforcement learning(DRL)as an artificial intelligence approach to control a quantum system.We verify that DRL explores fast and robust digital quantum controls with operation time analytically hinted by shortcuts to adiabaticity.In particular,the protocol’s robustness against both over-rotations and off-resonance errors can still be achieved simultaneously without any priori input.For the thorough comparison,we choose the task as single-qubit flipping,in which various analytical methods are well-developed as the benchmark,ensuring their feasibility in the quantum system as well.Consequently,a gate operation is demonstrated on a trapped^(171) Yb^(+)ion,significantly outperforming analytical pulses in the gate time and energy cost with hybrid robustness,as well as the fidelity after repetitive operations under time-varying stochastic errors.Our experiments reveal a framework of computer-inspired quantum control,which can be extended to other complicated tasks without loss of generality.

关键词： quantum control reinforcement learning trapped ion quantum computing noise robustness

Quantum feedback cooling of two trapped ions

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Chinese Physics B 2017年第7期26卷 106-110页

作者：张硕吴伟吴春旺李风光李坦汪翔鲍皖苏 Zhengzhou Information Science and Technology Institute Henan Key Laboratory of Quantum Information and Cryptography College of Science National University of Defense Technology

We present a sub-Doppler cooling scheme of a two-trapped-ion crystal by quantum feedback control method. In the scheme, we obtain the motional information by continuously measuring the spontaneous emission photons from one single ion of the crystal, and then apply a feedback force to cool the whole chain down.We derive the cooling dynamics of the cooling scheme using quantum feedback theory and quantum regression theorem. The result shows that with experimentally achievable parameters, our scheme can achieve lower temperature and faster cooling rate than Doppler cooling.

关键词： laser cooling trapped ion quantum optics

Preparation of nonclassical states and measurement of the Wigner function for the collective motion of N trapped ions

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Chinese Physics B 2004年第11期13卷 1862-1865页

作者：郑仕标 DepartmentofElectronicScienceandAppliedPhysics FuzhouUniversityFuzhou350002China

We propose a scheme for generating nonclassical states for the centre-of-mass vibrational mode of N trapped ions,including superpositions of several coherent states on a circle and Fock states. In the scheme N trapped ions are driven by a laser beam tuned to the carrier. The scheme also provides a new prospect for laser cooling. The scheme can be used to measure the Wigner function of the collective vibrational mode.

关键词： nonclassical state Wigner function trapped ion