Quantum correlation of a three-particle-class state under quantum decoherence  

作　　者：许鹏 王栋 叶柳 

机构地区：[1]School of Physics and Material Science,Anhui University

出　　处：《Chinese Physics B》2013年第10期119-124,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11074002,61275119,and 11247256);the Doctoral Science Foundation of the Ministry of Education of China(Grant No.20103401110003);the Fund of the Education Department of Anhui Province for Outstanding Youth,China(Grant No.2012SQRL023);the Doctor Scientific Research Fund of Anhui University,China(Grant No.33190058);the Personal Development Foundation of Anhui Province,China(Grant No.2008Z018)

摘　　要：We investigate the quantum characteristics of a three-particle W-class state and reveal the relationship between quan- tum discord and quantum entanglement under decoherence. We can also identify the state for which discord takes a maximal value for a given decoherence factor, and present a strong bound on quantum entanglement-quantum discord. In contrast, a striking result will be obtained that the quantum discord is not always stronger than the entanglement of formation in the case of decoherence. Furthermore, we also theoretically study the variation trend of the monogamy of quantum correlations for the three-particle W-class state under the phase flip channel, and find that the three-particle W-class state could transform from polygamous into monogamous, owing to the decoherence.We investigate the quantum characteristics of a three-particle W-class state and reveal the relationship between quan- tum discord and quantum entanglement under decoherence. We can also identify the state for which discord takes a maximal value for a given decoherence factor, and present a strong bound on quantum entanglement-quantum discord. In contrast, a striking result will be obtained that the quantum discord is not always stronger than the entanglement of formation in the case of decoherence. Furthermore, we also theoretically study the variation trend of the monogamy of quantum correlations for the three-particle W-class state under the phase flip channel, and find that the three-particle W-class state could transform from polygamous into monogamous, owing to the decoherence.

关 键 词：quantum correlations quantum entanglement quantum discord W-class state 

分 类 号：O431.2[机械工程—光学工程]