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Quantum correlations at negative absolute temperatures

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Abstract

We study behavior of quantum discord, a kind of quantum correlation, in systems of dipole–dipole interacting spins in an external magnetic field in the whole temperature range (\(-\infty <T<\infty \)). It was shown that negative temperatures, which are introduced to describe inversions in the population in a finite level system, provide more favorable conditions for emergence of quantum correlations including entanglement. We show that at negative temperature, the correlations become more intense and discord exists between remote spins being in separated states.

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Authors and Affiliations

  1. Physics Department, Ben Gurion University of the Negev, Beer Sheva, 84105, Israel

    Gregory B. Furman, Shaul D. Goren, Victor M. Meerovich & Vladimir L. Sokolovsky

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  1. Gregory B. Furman
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  2. Shaul D. Goren
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  3. Victor M. Meerovich
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  4. Vladimir L. Sokolovsky
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Correspondence to Gregory B. Furman.

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Furman, G.B., Goren, S.D., Meerovich, V.M. et al. Quantum correlations at negative absolute temperatures. Quantum Inf Process 13, 2759–2768 (2014). https://doi.org/10.1007/s11128-014-0826-7

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  • DOI: https://doi.org/10.1007/s11128-014-0826-7

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