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dc.contributor.authorPinto, João P. G.-
dc.contributor.authorKarpat, Göktuǧ-
dc.contributor.authorFanchini, Felipe F.-
dc.identifier.citationPhysical Review A - Atomic, Molecular, and Optical Physics, v. 88, n. 3, 2013.-
dc.description.abstractIt is known that quantum discord might experience a sudden transition in its dynamics when calculated for certain Bell-diagonal states (BDS) that are in interaction with their surroundings. We examine this phenomenon, known as the sudden change of quantum discord, considering the case of two qubits independently interacting with dephasing reservoirs. We first demonstrate that, for a class of initial states which can be chosen arbitrarily close to BDS, the transition is in fact not sudden, although it might numerically appear so if not studied carefully. Then, we provide an extension of this discussion covering the X-shaped density matrices. Our findings suggest that the transition of quantum discord might be sudden only for an highly idealized zero-measure subset of states within the set of all possible initial conditions of two qubits. © 2013 American Physical Society.en
dc.titleSudden change of quantum discord for a system of two qubitsen
dc.contributor.institutionUniversidade Federal de Ouro Preto (UFOP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationDepartamento de Física Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, 35400-000-
dc.description.affiliationFaculdade de Ciências UNESP (Universidade Estadual Paulista), Bauru, Sao Paulo, 17033-360-
dc.description.affiliationUnespFaculdade de Ciências UNESP (Universidade Estadual Paulista), Bauru, Sao Paulo, 17033-360-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhysical Review A: Atomic, Molecular, and Optical Physics-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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