Examining quantum correlations in the XY spin chain by local quantum uncertainty

Examining quantum correlations in the XY spin chain by local quantum uncertainty We study the thermal quantum correlations in terms of entanglement, quantum discord (QD) and local quantum uncertainty (LQU) in the XY spin chain, and analyze their capability in detecting the critical points of quantum phase transition. By considering the effects of the three-site interaction, site distance, system size and anisotropy parameter, we show that LQU is superior to QD in detecting the critical points. The advantages of LQU are not to be restricted to zero temperature, and it is possible to estimate the critical points at high temperature. Furthermore, the properties of LQU are very interesting and exhibit different quantum correlations which cannot be shown by entanglement and QD. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Examining quantum correlations in the XY spin chain by local quantum uncertainty

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Publisher
Springer US
Copyright
Copyright © 2015 by Springer Science+Business Media New York
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-015-0933-0
Publisher site
See Article on Publisher Site

Abstract

We study the thermal quantum correlations in terms of entanglement, quantum discord (QD) and local quantum uncertainty (LQU) in the XY spin chain, and analyze their capability in detecting the critical points of quantum phase transition. By considering the effects of the three-site interaction, site distance, system size and anisotropy parameter, we show that LQU is superior to QD in detecting the critical points. The advantages of LQU are not to be restricted to zero temperature, and it is possible to estimate the critical points at high temperature. Furthermore, the properties of LQU are very interesting and exhibit different quantum correlations which cannot be shown by entanglement and QD.

Journal

Quantum Information ProcessingSpringer Journals

Published: Feb 4, 2015

References

  • Quantum information and computation
    Bennett, CH; Sicincenzo, DP
  • Geometric measure of quantum discord
    Luo, SL; Fu, SS
  • Critical point estimation and long-range behavior in the one-dimensional XY model using thermal quantum and total correlations
    Cakmak, B; Karpat, G; Gedik, Z
  • Characterizing nonclassical correlations via local quantum uncertainty
    Girolami, D; Tufarelli, T; Adesso, G

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