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

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【作者】 周凤雪； 张理达； 祁义红； 钮月萍； 张敬涛； 龚尚庆；

【Author】 Zhou Feng-Xue a),Zhang Li-Da a),Qi Yi-Hong b),Niu Yue-Ping a),Zhang Jing-Tao a),and Gong Shang-Qing a)b) a) State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China b) Department of Physics,East China University of Science and Technology,Shanghai 200237,China

【机构】 State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences； Department of Physics,East China University of Science and Technology；

【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 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.

【Abstract】 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.

【关键词】 quantum entanglement； decoherence； qubits； Heisenberg model；
【Key words】 quantum entanglement； decoherence； qubits； Heisenberg model；
【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)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2011年08期
  • 【分类号】O413.1
  • 【下载频次】19
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