中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3198-3202.doi: 10.1088/1674-1056/17/9/008

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A study on entanglement dynamics for a four-qubit model

满忠晓, 夏云杰   

  1. College of Physics and Engineering, Qufu Normal University, Qufu 273165, China
  • 收稿日期:2008-01-14 修回日期:2008-02-23 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by National Natural Science Foundation of China (Grant No 10774088).

A study on entanglement dynamics for a four-qubit model

Man Zhong-Xiao(满忠晓)† and Xia Yun-Jie(夏云杰)   

  1. College of Physics and Engineering, Qufu Normal University, Qufu 273165, China
  • Received:2008-01-14 Revised:2008-02-23 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by National Natural Science Foundation of China (Grant No 10774088).

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摘要： In this paper, we consider the entanglement dynamics of a four-qubit model [2006 {\em Phys. Rev.} A \textbf{74} 042328] where two entangled qubits a and b locally interact with separate qubits A and B via the spin-exchange-like Hamiltonian. We study the effect of purity of initial entangled state of qubits a, b on the entanglement evolution and its relation with energy transfer. Also, we find that the total bipartite entanglement of qubits a, b plus A, B is not a constant any longer when the initial entangled state of a, b is not pure, which is a complement to the result in the paper [2007 {\em J. Phys.} B \textbf{40} S45] for the pure case.

关键词: entanglement dynamics, entanglement sudden death, purity

Abstract: In this paper, we consider the entanglement dynamics of a four-qubit model [2006 Phys. Rev. A 74 042328] where two entangled qubits a and b locally interact with separate qubits A and B via the spin-exchange-like Hamiltonian. We study the effect of purity of initial entangled state of qubits a, b on the entanglement evolution and its relation with energy transfer. Also, we find that the total bipartite entanglement of qubits a, b plus A, B is not a constant any longer when the initial entangled state of a, b is not pure, which is a complement to the result in the paper [2007 J. Phys. B 40 S45] for the pure case.

Key words: entanglement dynamics, entanglement sudden death, purity

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations)