Thermal Quantum Discord in Anisotropic Heisenberg XXZ Model with Dzyaloshinskii-Moriya Interaction  

作　　者：陈一新 尹志 

机构地区：[1]Zhejiang Insitute of Modern Physics,Zhejiang University

出　　处：《Communications in Theoretical Physics》2010年第7期60-66,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.90503009,10775116;973 Program under Grant No.2005CB724508

摘　　要：The thermal quantum discord （QD） is studied in a two-qubit Heisenberg XXZ system with DzyaloshinskiiMoriya （DM） interaction. We compare the thermal QD with thermal entanglement in this system and find remarkable differences between them. For instance, we show situations where QD decreases asymptotically to zero with temperature T while entanglement decreases to zero at the point of critical temperature, situations where QD decreases with certain tunable parameters such as Dx and Dx when entanglement increases. We find that the characteristic of QD is exotic in this system and this possibly offers a potential solution to enhance entanglement of a system. We also show that tunable parameter Dx is more efficient than parameter Dz in most regions for controlling the QD.

关 键 词：thermal quantum discord Heisenberg XXZ model Dzyaloshinskii-Moriya interaction 

分 类 号：O413[理学—理论物理] O413.1[理学—物理]