Alternative fidelity measure between quantum states

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dc.contributor.authorMendonca, Paulo E. M. F.
dc.contributor.authorNapolitano, Reginaldo D. J.
dc.contributor.authorMarchiolli, Marcelo A. [UNESP]
dc.contributor.authorFoster, Christopher J.
dc.contributor.authorLiang, Yeong-Cherng
dc.contributor.institutionUniv Queensland
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Sydney
dc.date.accessioned2013-09-30T18:58:12Z
dc.date.accessioned2014-05-20T14:11:46Z
dc.date.available2013-09-30T18:58:12Z
dc.date.available2014-05-20T14:11:46Z
dc.date.issued2008-11-01
dc.description.abstractWe propose an alternative fidelity measure (namely, a measure of the degree of similarity) between quantum states and benchmark it against a number of properties of the standard Uhlmann-Jozsa fidelity. This measure is a simple function of the linear entropy and the Hilbert-Schmidt inner product between the given states and is thus, in comparison, not as computationally demanding. It also features several remarkable properties such as being jointly concave and satisfying all of Jozsa's axioms. The trade-off, however, is that it is supermultiplicative and does not behave monotonically under quantum operations. In addition, metrics for the space of density matrices are identified and the joint concavity of the Uhlmann-Jozsa fidelity for qubit states is established.en
dc.description.affiliationUniv Queensland, Dept Phys, Brisbane, Qld 4072, Australia
dc.description.affiliationUniv São Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.affiliationUniv Sydney, Sch Phys, Sydney, NSW 2006, Australia
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipBrazilian Millennium Institute for Quantum Information,
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipAustralian Research Council (ARC)
dc.description.sponsorshipIdFAPESP: 05/04105-5
dc.format.extent11
dc.identifierhttp://dx.doi.org/10.1103/PhysRevA.78.052330
dc.identifier.citationPhysical Review A. College Pk: Amer Physical Soc, v. 78, n. 5, p. 11, 2008.
dc.identifier.doi10.1103/PhysRevA.78.052330
dc.identifier.fileWOS000261215600066.pdf
dc.identifier.issn1050-2947
dc.identifier.urihttp://hdl.handle.net/11449/24487
dc.identifier.wosWOS:000261215600066
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.ispartofPhysical Review A
dc.relation.ispartofsjr1,288
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleAlternative fidelity measure between quantum statesen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmer Physical Soc
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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