Quantum discord and quantum phase transition in spin chains

Details Quantum discord and quantum phase transition in spin chains Quantum discord and quantum phase transition in spin chains

2008-09-10

arxiv.org/abs/0809.1723v2

Phys. Rev. B 78, 224413 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 9 figures

Scientific paper

10.1103/PhysRevB.78.224413

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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