Generalized squeezing operators, bipartite Wigner functions and entanglement via Wehrl's entropy functionals

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dc.contributor.authorMarchiolli, Marcelo A. [UNESP]
dc.contributor.authorGaletti, Diogenes [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:54:25Z
dc.date.accessioned2014-05-20T14:09:51Z
dc.date.available2013-09-30T18:54:25Z
dc.date.available2014-05-20T14:09:51Z
dc.date.issued2008-10-01
dc.description.abstractWe introduce a new class of unitary transformations based on the su(1, 1) Lie algebra that generalizes, for certain particular representations of its generators, well-known squeezing transformations in quantum optics. To illustrate our results, we focus on the two-mode bosonic representation and show how the parametric amplifier model can be modified in order to generate such a generalized squeezing operator. Furthermore, we obtain a general expression for the bipartite Wigner function which allows us to identify two distinct sources of entanglement, here labelled dynamical and kinematical entanglement. We also establish a quantitative estimate of entanglement for bipartite systems through some basic definitions of entropy functionals in continuous phase-space representations.en
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent9
dc.identifierhttp://dx.doi.org/10.1088/0031-8949/78/04/045007
dc.identifier.citationPhysica Scripta. Bristol: Iop Publishing Ltd, v. 78, n. 4, p. 9, 2008.
dc.identifier.doi10.1088/0031-8949/78/04/045007
dc.identifier.issn0031-8949
dc.identifier.urihttp://hdl.handle.net/11449/24225
dc.identifier.wosWOS:000259699900007
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofPhysica Scripta
dc.relation.ispartofjcr1.902
dc.relation.ispartofsjr0,376
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleGeneralized squeezing operators, bipartite Wigner functions and entanglement via Wehrl's entropy functionalsen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/info/page/openaccess
dcterms.rightsHolderIop Publishing Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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