A study on entanglement dynamics for a four-qubit model

被引：0
|
作者：
Man Zhong-Xiao [1 ]
Xia Yun-Jie [1 ]
机构：
[1] Qufu Normal Univ, Coll Phys & Engn, Qufu 273165, Peoples R China
来源：
CHINESE PHYSICS B | 2008年 / 17卷 / 09期
基金：
中国国家自然科学基金;
关键词：
entanglement dynamics; entanglement sudden death; purity;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：3198 / 3202
页数：5
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