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