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Quantum Information Processing

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01-11-2018

Herring–Flicker coupling and thermal quantum correlations in bipartite system

Author: Kapil K. Sharma

Published in: Quantum Information Processing | Issue 11/2018

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Abstract

In this paper, we study thermal quantum correlations as quantum discord and entanglement in bipartite system imposed by external magnetic field with Herring–Flicker coupling, i.e., \(J(R)=1.642 e^{-2 R} R^{5/2}+O(R^{2}e^{-2R})\). The Herring–Flicker coupling strength is the function of R, which is the distance between spins and systems carry XXX Heisenberg interaction. By tuning the coupling distance R, temperature and magnetic field quantum correlations can be scaled in the bipartite system. We find the long sustainable behavior of quantum discord in comparison with entanglement over the coupling distance R. We also investigate the situations, where entanglement totally dies but quantum discord exists in the system.

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Title: Herring–Flicker coupling and thermal quantum correlations in bipartite system
Author: Kapil K. Sharma
Publication date: 01-11-2018
Publisher: Springer US
Published in: Quantum Information Processing / Issue 11/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-018-2089-1

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