Global quantum discord and quantum phase transition in XY model
Si-Yuan Liu, Yu-Ran Zhang, Wen-Li Yang, Heng Fan
TL;DR
This paper investigates how global quantum discord (GQD) can effectively signal different quantum phase transitions in the XY model, revealing the relationship between quantum correlations and phase changes.
Contribution
It demonstrates that specific features of GQD accurately characterize distinct quantum phase transitions in the XY model, providing new insights into quantum correlation behavior.
Findings
Maximum sum of nearest neighbor GQDs signals Ising transition
Sudden change of GQD characterizes other phase transition
GQD features reveal properties of quantum phases
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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