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Communications in Theoretical Physics 2006年第4X期46卷 631-634页

作者： SONG Ke-Hui ZHOU Zheng-Wei GUO Guang-Can Key Laboratory of quantum Communication and quantum Computation University of Science and Technology of China Hefei 230026 China Department of Electronic Information Science and Physics Huaihua University Huaihua 418008China

We present a scheme to realize geometric phase-shift gate for two superconducting quantum interference device （SQUID） qubits coupled to a single-mode microwave field. The geometric phase-shift gate operation is performed in two lower flux states, and the excited state [2〉 would not participate in the procedure. The SQUIDs undergo no transitions during the gate operation. Thus, the docoherence due to energy spontaneous emission based on the levels of SQUIDs are suppressed. The gate is insensitive to the cavity decay throughout the operation since the cavity mode is displaced along a circle in the phase space, acquiring a phase conditional upon the two lower flux states of the SQUID qubits, and the cavity mode is still in the original vacuum state. Based on the SQUID qubits interacting with the cavity mode, our proposed approach may open promising prospects for quantum iogic in SQUID-system.

关键词： geometric phase-shift gate superconducting quantum interference device cavity-QED

An experimental scheme to verify the dynamics of the Aharonov-Bohm effect

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Chinese Physics B 2009年第8期18卷 3226-3232页

作者：王瑞峰 Department of Physics Beijing Jiaotong University

There are two different viewpoints on the Aharonov-Bohm （A-B） effect. One asserts that the A-B effect is due to the existence of the vector potential A. The other asserts that the A-B effect is due to the interaction energy between the magnetic field produced by the moving charges and the magnetic field in the solenoid. The difference of these two viewpoints is analyzed in this paper. To judge which viewpoint is right, this paper suggests a new experimental method.

关键词： Aharonov-Bohm effect superconductivity superconducting quantum interference device

A simple scheme to generate χ-type four-charge entangled states in circuit QED

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Chinese Physics B 2012年第4期21卷 331-335页

作者：高贵龙宋付权黄寿胜王辉袁先漳王明锋姜年权 College of Physics and Electric Information Wenzhou UniversityWenzhou 325035China Department of Physics Zhejiang Normal UniversityJinhua 321004China

We propose a simple scheme to generate x-type four-charge entangled states by using SQUID-based charge qubits capacitively coupled to a transmission line resonator （TLR）. The coupling between the superconducting qubit and the TLR can be effectively controlled by properly adjusting the control parameters of the charge qubit. The experimental feasibility of our scheme is also shown.

关键词： x-type entangled state superconducting quantum interference device transmission line resonator superconducting charge qubit

Analysis Theory of Asymmetric dc SQUID Driven by Thermal Noises

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Communications in Theoretical Physics 2004年第5期41卷 707-714页

作者： LǖHai-Feng JIAYa HUANGXin-Tang DepartmentofPhysics CentralChinaNormalUniversityWuhan430079China

An analysis expression for the stationary probability distribution of asymmetric superconducting quantum interference device with two Josephson junctions (dc SQUID) driven by thermal noise is derived from two-dimensional Fokker-Planck equation, where the potential condition is satisfied. Two of the three asymmetric parameters, inductance asymmetric parameter η and critical current asymmetric parameter α, can be changed in this condition, but resistance asymmetric parameter ρ cannot be changed. The 'ripple' phenomenon of circulating current can disappear with the change of coefficient α. The effects of asymmetric parameters on current-voltage relationship and transfer function of dc SQUID system are also represented.

关键词： noise Fkker-Planck equation superconducting quantum interference device

quantum Entanglement of Two Flux Qubits Induced by an Auxiliary SQUID

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Communications in Theoretical Physics 2007年第12期48卷 1003-1008页

作者： SHI Tao SONG Zhi Department of Physics,Nankai University,Tianjin 300071,China Department of Physics Nankai University Tianjin 300071 China

We revisit a theoretical scheme to create quantum entanglement of two three-level superconducting quantuminterference devices (SQUIDs) with the help of an auxiliary *** this scenario,two three-level systems are coupledto a quantized cavity field and a classical external field and thus form dark *** quantum entanglement can beproduced by a quantum measurement on the auxiliary *** investigation emphasizes the quantum effect of theauxiliary *** the experimental feasibility and accessibility of the scheme,we calculate the time evolution of thewhole system including the auxiliary *** ensure the efficiency of generating quantum entanglement,relationsbetween the measurement time and dominate parameters of the system are analyzed according to detailed calculations.

关键词： superconducting quantum interference device entangled state quantum information dark state

Implementation of a Controlled-Phase Gate and Deutsch-Jozsa Algorithm with superconducting Charge Qubits in a Cavity

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Communications in Theoretical Physics 2007年第5期47卷 821-825页

作者： SONG Ke-Hui ZHOU Zheng-Wei GUO Guang-Can Department of Physics and Electronic Information Science Huaihua University Huaihua 418008 China Key Laboratory of quantum Information University of Science and Technology of China Hefei 230026 China

Based on superconducting quantum interference devices （SQUIDs） coupled to a cavity, we propose a scheme for implementing a quantum controlled-phase gate （QPG） and Deutsch-Jozsa （D J） algorithm by a controllable interaction. In the present scheme, the SQUID works in the charge regime, and the cavity field is ultilized as quantum data-bus, which is sequentially coupled to only one qubit at a time. The interaction between the selected qubit and the data bus, such as resonant and dispersive interaction, can be realized by turning the gate capacitance of each SQUID. Especially, the bus is not excited and thus the cavity decay is suppressed during the implementation of DJ algorithm. For the QPG operation, the mode of the bus is unchanged in the end of the operation, although its mode is really excited during the operations. Finally, for typical experiment data, we analyze simply the experimental feasibility of the proposed scheme. Based on the simple operation, our scheme may be realized in this solid-state system, and our idea may be realized in other systems.

关键词： a quantum controlled-phase gate Deutsch-Jozsa algorithm superconducting quantum interference device charge qubit