Quantum discord for a central two-qubit system coupled to an XY spin chain with Dzyaloshinsky-Moriya interaction

被引：11
|
作者：
Qiu, Liang [1 ]
Wang, An Min [2 ]
机构：
[1] China Univ Min & Technol, Dept Phys, Xuzhou 221116, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
来源：
PHYSICA SCRIPTA | 2011年 / 84卷 / 04期
基金：
中国国家自然科学基金;
关键词：
SUDDEN-DEATH; ENTANGLEMENT; STATES;
D O I：
10.1088/0031-8949/84/04/045021
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigated the quantum discord dynamics of a central two-qubit system coupled to an XY spin chain with the Dzyaloshinsky-Moriya (DM) interaction. We found that the DM interaction does not affect the behavior of the quantum phase transition induced by the external magnetic field. Moreover, the DM interaction enhances the decay of quantum discord in the weak-coupling regime, while it has no obvious effect on the quantum discord dynamics in the strong-coupling regime.
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页数：6
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