Bell violation for the thermal states of an XXZ spin chain with Dzialoshiski-Moriya interaction  

作　　者：MA XiaoSan 1 & WANG AnMin 2 1 School of Electric Engineering and Information,Anhui University of Technology,Maanshan 243002,China 2 Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第11期2074-2079,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10947115 and 10975125);partially supported by the Fund for Young Talented Teachers of Anhui Province (Grant No.2010SQRL037ZD)

摘　　要：The effect of Dzialoshiski-Moriya (DM) interaction on the violation of Bell inequality for thermal states of interacting qubits via a two-qubit XXZ spin chain is investigated.Our results imply that the DM interaction and anisotropy taking a large positive value can enhance the Bell violation and improve the threshold temperatures of it.By the comparison between the Bell violation and thermal entanglement,we find that the threshold temperatures of thermal entanglement are higher than those of the Bell violation.This implies that some states are entangled but the Bell inequality is not violated.The effect of Dzialoshiski-Moriya (DM) interaction on the violation of Bell inequality for thermal states of interacting qubits via a two-qubit XXZ spin chain is investigated.Our results imply that the DM interaction and anisotropy taking a large positive value can enhance the Bell violation and improve the threshold temperatures of it.By the comparison between the Bell violation and thermal entanglement,we find that the threshold temperatures of thermal entanglement are higher than those of the Bell violation.This implies that some states are entangled but the Bell inequality is not violated.

关 键 词：BELL VIOLATION threshold temperatures DM INTERACTION 

分 类 号：O413.1[理学—理论物理]