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Witnessing quantum discord in 2 x N systems

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dc.contributor.author Bylicka, Bogna
dc.contributor.author Chruściński, Dariusz
dc.date.accessioned 2012-11-30T08:46:17Z
dc.date.available 2012-11-30T08:46:17Z
dc.date.issued 2010-04-03
dc.identifier.citation Phys. Rev. A 81, 062102 (2010)
dc.identifier.uri http://repozytorium.umk.pl/handle/item/181
dc.description.abstract Bipartite states with vanishing quantum discord are necessarily separable and hence positive partial transpose (PPT). We show that 2 x N states satisfy additional property: the positivity of their partial transposition is recognized with respect to the canonical factorization of the original density operator. We call such states SPPT (for strong PPT). Therefore, we provide a natural witness for a quantum discord: if a 2 x N state is not SPPT it must contain nonclassical correlations measured by quantum discord. It is an analog of the celebrated Peres-Horodecki criterion: if a state is not PPT it must be entangled.
dc.language.iso eng
dc.relation.uri http://arxiv.org/abs/1004.0434
dc.rights info:eu-repo/semantics/openAccess
dc.subject Quantum Physics
dc.title Witnessing quantum discord in 2 x N systems
dc.type info:eu-repo/semantics/article


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