Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a 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 ave derived and analysed. It is shown that for the symmetric initial α...

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Bibliographic Details
Published in:Chinese physics B 2011-08, Vol.20 (8), p.23-29, Article 080302
Main Authors: Zhou, Feng-Xue, Zhang, Li-Da, Qi, Yi-Hong, Niu, Yue-Ping, Zhang, Jing-Tao, Gong, Shang-Qing
Format: Article
Language:English
Subjects:
Dynamical systems
Dynamics
Entanglement
Evolution
Mathematical analysis
Nonuniform
Nonuniform magnetic fields
Qubits (quantum computing)
XY模型
动力学
海森堡
纠缠
自旋系统
自旋轨道相互作用
量子比特
非均匀磁场
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/8/080302