Observable correlations in two-qubit states

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)165-177
Journal / PublicationJournal of Statistical Physics
Volume136
Issue number1
Publication statusPublished - Jul 2009

Abstract

The total correlations in a bipartite quantum state are well quantified by the quantum mutual information, the amount of which is not necessarily fully extractable by local measurements. The observable correlations are the maximal correlations that can be extracted via local measurements, and have an intuitive interpretation as a measure of classical correlations. We evaluate the observable correlations for generic two-qubit states and obtain analytical expressions in some particular cases. The intricate and subtle relationships among the total, quantum and classical correlations are illustrated in terms of observable correlations. In the course, we also disprove an intuitive conjecture of Lindblad which states that the classical correlations account for at least half of the total correlations, or equivalently, correlations are more classical than quantum. © Springer Science+Business Media, LLC 2009.

Research Area(s)

  • Classical correlations, Lindblad conjecture, Observable correlations, Quantum mutual information, Von Neumann measurement

Citation Format(s)

Observable correlations in two-qubit states. / Luo, Shunlong; Zhang, Qiang.
In: Journal of Statistical Physics, Vol. 136, No. 1, 07.2009, p. 165-177.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review