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NMR dynamics of quantum discord for spin-carrying gas molecules in a closed nanopore

  • Atoms, Molecules, Optics
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Abstract

A local orthogonal transformation that transforms any centrosymmetric density matrix of a two-qubit system to the X form has been found. A piecewise-analytic-numerical formula Q = min{Q π/2, Q θ, Q 0}, where Q π/2 and Q 0 are analytical expressions and the branch Q 0 θ can be obtained only by numerically searching for the optimal measurement angle θ ∈ (0, π/2), is proposed to calculate the quantum discord Q of a general X state. The developed approaches have been applied for a quantitative description of the recently predicted flickering (periodic disappearance and reappearance) of the quantum-information pair correlation between nuclear 1/2 spins of atoms or molecules of a gas (for example, 129Xe) in a bounded volume in the presence of a strong magnetic field.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    M. A. Yurishchev

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  1. M. A. Yurishchev
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Correspondence to M. A. Yurishchev.

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Original Russian Text © M.A. Yurishchev, 2014, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 146, No. 5, pp. 946–956.

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Yurishchev, M.A. NMR dynamics of quantum discord for spin-carrying gas molecules in a closed nanopore. J. Exp. Theor. Phys. 119, 828–837 (2014). https://doi.org/10.1134/S106377611411020X

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  • DOI: https://doi.org/10.1134/S106377611411020X

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