Unifying approach to the quantification of bipartite correlations by Bures distance

Rosario Lo Franco, Marco Cianciaruso, Thomas R. Bromley, Gerardo Adesso, Rosario Lo Franco

Risultato della ricerca: Articlepeer review

49 Citazioni (Scopus)

Abstract

The notion of distance defined on the set of states of a composite quantum system can be used to quantify total, quantum and classical correlations in a unifying way. We provide new closed formulae for classical and total correlations of two-qubit Bell-diagonal states by considering the Bures distance. Complementing the known corresponding expressions for entanglement and more general quantum correlations, we thus complete the quantitative hierarchy of Bures correlations for Bell-diagonal states. We then explicitly calculate Bures correlations for two relevant families of states: Werner states and rank-2 Bell-diagonal states, highlighting the subadditivity which holds for total correlations with respect to the sum of classical and quantum ones when using Bures distance. Finally, we analyse a dynamical model of two independent qubits locally exposed to non-dissipative decoherence channels, where both quantum and classical correlations measured by Bures distance exhibit freezing phenomena, in analogy with other known quantifiers of correlations.
Lingua originaleEnglish
pagine (da-a)405302-
Numero di pagine20
RivistaJOURNAL OF PHYSICS. A, MATHEMATICAL AND THEORETICAL
Volume47
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.2600.2613???
  • ???subjectarea.asjc.2600.2611???
  • ???subjectarea.asjc.2600.2610???
  • ???subjectarea.asjc.3100.3100???

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