Entanglement sudden death induced by the Dzialoshinskii-Moriya interaction  

作　　者：曾红芳 邵彬 杨林广 李建 邹健 

机构地区：[1]Department of Physics,School of Sciences,Beijing Institute of Technology

出　　处：《Chinese Physics B》2009年第8期3265-3270,共6页中国物理B（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No 10374007)

摘　　要：In this paper, we study the entanglement dynamics of two-spin Heisenberg XYZ model with the Dzialoshinskii- Moriya （DM） interaction. The system is initially prepared in the Werner state. The effects of purity of the initial state and DM coupling parameter on the evolution of entanglement are investigated. The necessary and sufficient condition for the appearance of the entanglement sudden death （ESD） phenomenon has been deduced. The result shows that the ESD always occurs if the initial state is sufficiently impure for the given coupling parameter or the DM interaction is sufficiently strong for the given initial state. Moreover, the critical values of them are calculated.In this paper, we study the entanglement dynamics of two-spin Heisenberg XYZ model with the Dzialoshinskii- Moriya （DM） interaction. The system is initially prepared in the Werner state. The effects of purity of the initial state and DM coupling parameter on the evolution of entanglement are investigated. The necessary and sufficient condition for the appearance of the entanglement sudden death （ESD） phenomenon has been deduced. The result shows that the ESD always occurs if the initial state is sufficiently impure for the given coupling parameter or the DM interaction is sufficiently strong for the given initial state. Moreover, the critical values of them are calculated.

关 键 词：entanglement sudden death CONCURRENCE PURITY Dzialoshinskii-Moriya interaction 

分 类 号：O413.1[理学—理论物理]