文献类型：期刊文献

中文题名：Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a spin bath

英文题名：Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a spin bath

作者：Zhou, Feng-Xue[1]; Zhang, Li-Da[1]; Qi, Yi-Hong[2]; Niu, Yue-Ping[1]; Zhang, Jing-Tao[1]; Gong, Shang-Qing[1,2]

机构：[1] State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; [2] Department of Physics, East China University of Science and Technology, Shanghai 200237, China

年份：2011

卷号：20

期号：8

起止页码：23

中文期刊名：Chinese Physics B

外文期刊名：Chinese Physics B

收录：CSTPCD;;EI(收录号：20113414255657);Scopus;CSCD:【CSCD2011_2012】；

基金：Project supported by the National Natural Science Foundation of China (Grant Nos. 10874194,60978013,and 60921004);the International Cooperation Program from Science and Technology Commission of Shanghai Municipality (Grant No.10530704800)

语种：英文

中文关键词：quantum entanglement;decoherence;qubits;Heisenberg model

外文关键词：Dynamics - Magnetic fields - Quantum computers - Spin dynamics

摘要：This paper investigates the entanglement dynamics of a Heisenberg XY model for a two-spin system in the presence of a nonuniform magnetic field. The master equations and the concurrence evolution equations for the initial α state ave derived and analysed. It is shown that for the symmetric initial α state, only the nonuniform field can play a role in entanglement dynamics while the uniform field and the bath will not play such a role. For the asymmetric α state, the nonuniform field leads to the beat pattern oscillation of the concurrence evolution. The inhomogeneity of the field can enhance the entanglement by suppressing the decoherence effects of both the spin-orbit interaction and the spin bath.
This paper investigates the entanglement dynamics of a Heisenberg XY model for a two-spin system in the presence of a nonuniform magnetic field. The master equations and the concurrence evolution equations for the initial α state are derived and analysed. It is shown that for the symmetric initial α state, only the nonuniform field can play a role in entanglement dynamics while the uniform field and the bath will not play such a role. For the asymmetric α state, the nonuniform field leads to the beat pattern oscillation of the concurrence evolution. The inhomogeneity of the field can enhance the entanglement by suppressing the decoherence effects of both the spin - orbit interaction and the spin bath. ? 2011 Chinese Physical Society and IOP Publishing Ltd.