We extend the Hilbert-Schmidt (square norm) distance, previously used to define the geometric quantum discord, to define also geometric quantifiers of total and classical correlations. We then compare the dynamics of geometric and entropic quantifiers of the different kinds of correlations in a non-Markovian open two-qubit system under local dephasing. We find that qualitative differences occur only for quantum discords. This is taken to imply that geometric and entropic discords are not, in general, equivalent in describing the dynamics of quantum correlations. We then show that geometric and entropic quantifiers of total correlations also present qualitative disagreements in the state space. This aspect indicates that the differences found for quantum discord are not attributable to a different separation, introduced by each measure, between the quantum and classical parts of correlations. Finally, we find that the Hilbert-Schmidt distance formally coincides with a symmetrized form of linear relative entropy.

Bellomo, B., Lo Franco, R., & Compagno, G. (2012). Dynamics of geometric and entropic quantifiers of correlations in open quantum systems. PHYSICAL REVIEW A, 86(1), 012312-1-012312-6 [10.1103/PhysRevA.86.012312].

Dynamics of geometric and entropic quantifiers of correlations in open quantum systems

BELLOMO, Bruno;LO FRANCO, Rosario;COMPAGNO, Giuseppe
2012

Abstract

We extend the Hilbert-Schmidt (square norm) distance, previously used to define the geometric quantum discord, to define also geometric quantifiers of total and classical correlations. We then compare the dynamics of geometric and entropic quantifiers of the different kinds of correlations in a non-Markovian open two-qubit system under local dephasing. We find that qualitative differences occur only for quantum discords. This is taken to imply that geometric and entropic discords are not, in general, equivalent in describing the dynamics of quantum correlations. We then show that geometric and entropic quantifiers of total correlations also present qualitative disagreements in the state space. This aspect indicates that the differences found for quantum discord are not attributable to a different separation, introduced by each measure, between the quantum and classical parts of correlations. Finally, we find that the Hilbert-Schmidt distance formally coincides with a symmetrized form of linear relative entropy.
Settore FIS/03 - Fisica Della Materia
http://pra.aps.org/abstract/PRA/v86/i1/e012312
Bellomo, B., Lo Franco, R., & Compagno, G. (2012). Dynamics of geometric and entropic quantifiers of correlations in open quantum systems. PHYSICAL REVIEW A, 86(1), 012312-1-012312-6 [10.1103/PhysRevA.86.012312].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/66663
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