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Comment on “Quantum discord through the generalized entropy in bipartite quantum states”

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The Original Article was published on 23 April 2014

Abstract

In [X.-W. Hou, Z.-P. Huang, S. Chen, Eur. Phys. J. D 68, 87 (2014)], Hou et al. present, using Tsallis’ entropy, possible generalizations of the quantum discord measure, finding original results. As for the mutual informations and discord, we show here that these two types of quantifiers can take negative values. In the two qubits instance we further determine in which regions they are non-negative. Additionally, we study alternative generalizations on the basis of Rényi entropies.

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Authors and Affiliations

  1. IFLP-CCT-CONICET, Universidad Nacional de La Plata, C.C. 727, 1900, La Plata, Argentina

    Guido Bellomo & Angelo Plastino

  2. Instituto de Física, Universidade Federal do Rio de Janeiro, 21.942-972, Rio de Janeiro, Brazil

    Anna P. Majtey

  3. CeBio y Secretaria de Investigación, Universidad Nacional del Noroeste de la Provincia de Buenos Aires – UNNOBA and CONICET, R. Saenz Peña 456, Junin, Argentina

    Angel R. Plastino

Authors
  1. Guido Bellomo
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  2. Angelo Plastino
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  3. Anna P. Majtey
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  4. Angel R. Plastino
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Correspondence to Angelo Plastino.

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Bellomo, G., Plastino, A., Majtey, A. et al. Comment on “Quantum discord through the generalized entropy in bipartite quantum states”. Eur. Phys. J. D 68, 337 (2014). https://doi.org/10.1140/epjd/e2014-50474-x

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  • DOI: https://doi.org/10.1140/epjd/e2014-50474-x

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