Effect of Dzialoshinski-Moriya interaction on the quantum discord of a spin-star model |
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Authors: | Xiao San Ma Mu-Tian ChengGuang-Xing Zhao An Min Wang |
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Institution: | a School of Electric Engineering and Information, Anhui University of Technology, Ma’anshan, 243002, People’s Republic of Chinab Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, People’s Republic of China |
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Abstract: | The effect of Dzialoshinski-Moriya (DM) interaction on the quantum discord and the thermal entanglement of the density matrix of a spin star model is investigated. Our results imply that the quantum correlation measured by quantum discord and thermal entanglement can be established between two surrounding parties both of which have no interaction with each other but interact with the central party independently. From the analysis, we find that the strong DM interaction can enhance the quantum discord and thermal entanglement while the external magnetic field with a large value and the high temperature can shrink them. Specially, the quantum discord is more robust than the thermal entanglement in the sense that the range of parameters in which the quantum discord takes a zero value is much smaller than that of the thermal entanglement. |
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Keywords: | Quantum discord Dzialoshinski-Moriya interaction Thermal entanglement |
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