Quantum discord and quantum phase transition in spin chains

Raoul Dillenschneider
Phys. Rev. B 78, 224413 – Published 16 December 2008

Abstract

Quantum phase transitions of the transverse Ising and antiferromagnetic XXZ spin S=1/2 chains are studied using quantum discord. Quantum discord allows the measure of quantum correlations present in many-body quantum systems. It is shown that the amount of quantum correlations increases close to the critical points. The observations are in agreement with the information provided by the concurrence, which measures the entanglement of the many-body system.

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  • Received 26 September 2008

DOI:https://doi.org/10.1103/PhysRevB.78.224413

©2008 American Physical Society

Authors & Affiliations

Raoul Dillenschneider*

  • Department of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • *raoul.dillenschneider@physik.uni-augsburg.de

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Issue

Vol. 78, Iss. 22 — 1 December 2008

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