Global quantum discord and quantum phase transition in XY model |
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| Authors: | Si-Yuan Liu Yu-Ran Zhang Wen-Li Yang Heng Fan |
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| Affiliation: | 1. Institute of Modern Physics, Northwest University, Xian 710069, PR China;2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;3. Collaborative Innovation Center of Quantum Matter, Beijing 100190, PR China |
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| Abstract: | We study the relationship between the behavior of global quantum correlations and quantum phase transitions in XY model. We find that the two kinds of phase transitions in the studied model can be characterized by the features of global quantum discord (GQD) and the corresponding quantum correlations. We demonstrate that the maximum of the sum of all the nearest neighbor bipartite GQDs is effective and accurate for signaling the Ising quantum phase transition, in contrast, the sudden change of GQD is very suitable for characterizing another phase transition in the XY model. This may shed lights on the study of properties of quantum correlations in different quantum phases. |
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| Keywords: | Global quantum discord Quantum phase transition XY model |
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