Quantum Correlations in Heisenberg XY Chain  

作　　者：朱银燕 张勇 

机构地区：[1]School of Science, Beijing University of Posts and Telecommunications

出　　处：《Communications in Theoretical Physics》2013年第4期407-410,共4页理论物理通讯（英文版）

基　　金：Supported by Chinese Universities Scientific Fund under Grant No.BUPT2011RC070;the National Natural Science Foundation of China under Grant No.61178010

摘　　要：Quantum correlations measured by quantum discord （QD）, measurement-induced distance （MID）, and geometric measure of quantum discord （GMQD） in two-qubit Heisenberg XY spin chain are investigated. The effects of DM interaction and anisotropic on the three correlations are considered. Characteristics of various correlation measures for the two-qubit states are compared. The increasing Dz increases QD, MID and GMQD monotonously while the increasing anisotropy both increases and decreases QD and GMQD. The three quantum correlations are always existent at very high temperature. MID is always larger than QD, but there is no definite ordering between QD and GMQD. PACS numbers： 03.65.Ta, 03.67.Mn

关 键 词：quantum discord measurement=induced distance geometric measure of quantum discord 

分 类 号：O413.1[理学—理论物理] O413[理学—物理]