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Herring–Flicker coupling and thermal quantum correlations in bipartite system

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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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Acknowledgements

The authors acknowledge support from the Ministry of Electronics & Information Technology, Government of India, through the Centre of Excellence in Nano-Electronics, IIT Bombay.

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  1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India

    Kapil K. Sharma

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Sharma, K.K. Herring–Flicker coupling and thermal quantum correlations in bipartite system. Quantum Inf Process 17, 321 (2018). https://doi.org/10.1007/s11128-018-2089-1

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  • DOI: https://doi.org/10.1007/s11128-018-2089-1

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