Quantum discord and quantum phase transition in spin chains
Raoul Dillenschneider
TL;DR
This paper investigates quantum discord in spin chains, demonstrating that quantum correlations increase near critical points of quantum phase transitions, aligning with entanglement measures like concurrence.
Contribution
It introduces quantum discord as a tool to analyze quantum phase transitions in spin chains, highlighting its effectiveness alongside entanglement measures.
Findings
Quantum discord increases near critical points.
Quantum discord correlates with entanglement measures.
Quantum correlations are significant in many-body quantum systems.
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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