Pairwise Quantum Correlations for Superpositions of Dicke States  

作　　者：席政军 熊恒娜 李永明 王晓光 

机构地区：[1]College of Computer Science,Shaanxi Normal University [2]Zhejiang Institute of Modern Physics,Department of Physics,Zhejiang University

出　　处：《Communications in Theoretical Physics》2012年第5期771-779,共9页理论物理通讯（英文版）

基　　金：Supported by the Natural Science Foundation of China under Grant Nos.11025527,10935010,and 60873119;National Foundation Research Program of China under Grant No.2012CB921602;the Fundamental Research Funds for the Central Universities,and as well as the Superior Dissertation Foundation of Shannxi Normal University under Grant No.S2009YB03;the Higher School Doctoral Subject Foundation of Ministry of Education of China under Grant No.200807180005

摘　　要：Pairwise correlation is really an important property for multi-qubit states.For the two-qubit X states extracted from Dicke states and their superposition states,we obtain a compact expression of the quantum discord by numerical check.We then apply the expression to discuss the quantum correlation of the reduced two-qubit states of Dicke states and their superpositions,and the results are compared with those obtained by entanglement of formation,which is a quantum entanglement measure.

关 键 词：quantum correlation quantum discord ENTANGLEMENT Dicke states 

分 类 号：O413.1[理学—理论物理] O431.2[理学—物理]