A Comparative Study of Quantum Correlation Measures in an AF Critical Spin System with Next-Nearest-Neighbour Interaction

Authors: Amit Tribedi

Country: India

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Abstract: Recently some Quantum Information Theoretic measures like Entanglement and Quantum Discord have emerged as very important tools for investigating quantum systems. A number of such measures in a critical Heisenberg spin system (which undergoes a transition from a disordered phase to an antiferromagnetically ordered phase) have been studied in this work and some nontrivial features exhibited by the measures near Quantum Critical Points have been obtained. The nature of variation of those measures with a disorder-enhancing next-nearest-neighbor interaction of the model system has also been investigated. The work indicates that the Quantum discord is more robust than the so-called nonlocal correlations against some disordering interactions present in the system and also more consistent in signaling the changes brought about in the physical state by tuning the relevant parameters of the system across a Quantum Phase Transition. A novel universal scaling behavior exhibited by the measures has also been found.

Keywords: Quantum Correlations, Phase Transition, Disorder, Spin System, Discord

Paper Id: 1611

Published On: 2022-12-24

Published In: Volume 10, Issue 6, November-December 2022

Cite This: A Comparative Study of Quantum Correlation Measures in an AF Critical Spin System with Next-Nearest-Neighbour Interaction - Amit Tribedi - IJIRMPS Volume 10, Issue 6, November-December 2022.

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