中国物理B ›› 2008, Vol. 17 ›› Issue (2): 702-709.doi: 10.1088/1674-1056/17/2/057

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Quantum communication in spin star configuration

邓洪亮, 方细明   

  1. Key Laboratory of Quantum Structure and Quantum Control of Ministry of Education and Department of Physics, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2007-04-19 修回日期:2007-06-22 出版日期:2008-02-20 发布日期:2008-02-20
  • 基金资助:
    Project supported by the National Science Foundation (Grant No 2007CB925204).

Quantum communication in spin star configuration

Deng Hong-Liang(邓洪亮) and Fang Xi-Ming(方细明)†   

  1. Key Laboratory of Quantum Structure and Quantum Control of Ministry of Education and Department of Physics, Hunan Normal University, Changsha 410081, China
  • Received:2007-04-19 Revised:2007-06-22 Online:2008-02-20 Published:2008-02-20
  • Supported by:
    Project supported by the National Science Foundation (Grant No 2007CB925204).

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摘要： This paper considers a generalized spin star system which can be solved exactly, with the central spin-$\ddfrac{1}{2}$ system embedded in an outer ring of $N$ spin-$\ddfrac{1}{2}$ particles(denoted as spin bath). In this model, in addition to the central-outer interaction, each pair of nearest neighbour of the bath interacts within themselves. The general expressions of the eigenstates as well as the eigenvalues of the model are derived with the use of the symmetries of system. It analyses the quantum state transfer and the dynamical behaviour of entanglement created during quantum communication. It also analyses the efficiency of the configuration regarded as quantum phase covariant clone or decoherence model. Some interesting results are discovered concerning the properties of quantum communication in this model.

关键词: quantum state transfer, phase covariant clone, entanglement dynamics

Abstract: This paper considers a generalized spin star system which can be solved exactly, with the central spin-$\dfrac{1}{2}$ system embedded in an outer ring of $N$ spin-$\dfrac{1}{2}$ particles(denoted as spin bath). In this model, in addition to the central-outer interaction, each pair of nearest neighbour of the bath interacts within themselves. The general expressions of the eigenstates as well as the eigenvalues of the model are derived with the use of the symmetries of system. It analyses the quantum state transfer and the dynamical behaviour of entanglement created during quantum communication. It also analyses the efficiency of the configuration regarded as quantum phase covariant clone or decoherence model. Some interesting results are discovered concerning the properties of quantum communication in this model.

Key words: quantum state transfer, phase covariant clone, entanglement dynamics

中图分类号:  (Quantum communication)

  • 03.67.Hk
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 03.65.Ud (Entanglement and quantum nonlocality)