Global quantum discord and quantum phase transition in XY model

Journal Article · Sun Nov 15 00:00:00 EST 2015 · Annals of Physics

DOI:https://doi.org/10.1016/J.AOP.2015.09.014· OSTI ID:22560270

Liu, Si-Yuan ^[1]; Zhang, Yu-Ran ^[2]; Yang, Wen-Li ^[1]; Fan, Heng ^[2]

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1. Institute of Modern Physics, Northwest University, Xian 710069 (China)
2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

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.

• OSTI ID: 22560270
• Journal Information: Annals of Physics, Vol. 362, Issue Complete; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-4916
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
ISING MODEL
PHASE TRANSFORMATIONS
QUANTUM MECHANICS
QUANTUM STATES