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Chin. Phys. B, 2008, Vol. 17(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

Man Zhong-Xiao(满忠晓) and Xia Yun-Jie(夏云杰)
College of Physics and Engineering, Qufu Normal University, Qufu 273165, China
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.
Keywords:  entanglement dynamics      entanglement sudden death      purity  
Received:  14 January 2008      Revised:  23 February 2008      Accepted manuscript online: 
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Lx (Quantum computation architectures and implementations)  
Fund: Project supported by National Natural Science Foundation of China (Grant No 10774088).

Cite this article: 

Man Zhong-Xiao(满忠晓) and Xia Yun-Jie(夏云杰) A study on entanglement dynamics for a four-qubit model 2008 Chin. Phys. B 17 3198

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