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Entanglement Dynamics of Three Superconducting Charge Qubits Coupled to a Cavity

Communications in Theoretical Physics 2011年第5期55卷 775-782页

作者：赵宇靖米贤武向少华周方宋克慧 College of Physics Science and Information Engineering Jishou University Department of Physics and Information Engineering Huaihua University State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences Department of Physics and Information Engineering Huaihua University

We investigate the entanglement dynamics of a quantum system consisting of three superconducting charge qubits （SCQs） interacting with a microwave field. For separable and entangled states of the SCQs, the evolutions are studied under various photon numbers of cavity field. The results show that the amplitude and period of the bipartite entanglement square concurrences can be controlled by the choice of initial states of SCQs and photon number of cavity field, respectively. This simple model of a quantum register allows us to understand the dynamic process of the quantum storage of information carried by charge qubit.

关键词： charge qubits entanglement dynamics square concurrence

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Influence from Cavity Decay on Entanglement Evolution of Three Superconducting Charge Qubits Coupled to a Cavity

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Chinese Journal of Electronics 2014年第1期23卷 157-162页

作者： CHEN Shengping SONG Kehui XIANG Shaohua ZHAO Yujing College of Software and Service Outsourcing Jishou University Department of Physics and Information Engineering Huaihua University College of Physics Science and Information Engineering Jishou University

We investigate the entanglement dynamics of a quantum system consisting of three Superconducting charge qubits(SCQs) interacting with a single-mode cavity field. Considering the Rotating wave approximation(RWA) and the resonance condition, we give the effective Hamiltonian of the system involving cavity decay. The dynamical evolution is studied in terms of the entanglements in the different bipartite partitions of the system, as quantified by the square concurrence. With the choice of the appropriate initial states, a four-qubit W-entangled state can be obtained. We study the effect of cavity decay on various square concurrences in the system, the results show that the peak value of the square concurrence declines with the increase of cavity decay when the other parameters are fixed, but the cavity decay does not change the period of the square concurrence. We also find a natural entanglement transfer and entanglement invariant under evolution of the effective Hamiltonian.

关键词： Cavity decay Charge qubits Entanglement dynamics square concurrence

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