Quantum discord of thermal states of a spin chain with Calogero-Moser type interaction  

作　　者：MA XiaoSan QIAO Ying ZHAO GuangXing WANG AnMin 

机构地区：[1]School of Electric Engineering and Information,Anhui University of Technology [2]Department of Modern Physics,University of Science and Technology of China

出　　处：《Science China Chemistry》2013年第3期600-605,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11105001,10975125 and 11004001)

摘　　要：In this paper,we have investigated the effect of Calogero-Moser type interaction on the quantum discord of thermal states of a spin chain.Our results imply that the quantum discord depends on the relative distance between the spins,the external magnetic field,and the temperature.By a comparison between the quantum discord and the entanglement of formation,the quantum discord is more robust than the entanglement of formation in the sense that the latter takes a zero value in a large range of the parameters,while the former takes a nonzero value.In this paper, we have investigated the effect of Calogero-Moser type interaction on the quantum discord of thermal states of a spin chain. Our results imply that the quantum discord depends on the relative distance between the spins, the external mag- netic field, and the temperature. By a comparison between the quantum discord and the entanglement of formation, the quan- tum discord is more robust than the entanglement of formation in the sense that the latter takes a zero value in a large range of the parameters, while the former takes a nonzero value.

关 键 词：quantum discord entanglement of formation Calogero-Moser interactions 

分 类 号：O413[理学—理论物理] TK229.66[理学—物理]