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dc.contributor.authorMcNulty, Daniel
dc.contributor.authorTatham, Richard
dc.contributor.authorMista, Ladislav
dc.date.accessioned2014-09-17T08:31:03Z
dc.date.available2014-09-17T08:31:03Z
dc.date.issued2014-03-12
dc.identifier149089621
dc.identifier3ff0e6b6-3d21-4795-849c-f321c23c3c6e
dc.identifier000333179100004
dc.identifier84897824675
dc.identifier000333179100004
dc.identifier.citationMcNulty , D , Tatham , R & Mista , L 2014 , ' Nonexistence of entangled continuous-variable Werner states with positive partial transpose ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 89 , no. 3 , 032315 . https://doi.org/10.1103/PhysRevA.89.032315en
dc.identifier.issn1050-2947
dc.identifier.urihttps://hdl.handle.net/10023/5423
dc.descriptionD.M. acknowledges the support of the Operational Program Education for Competitiveness Project No. CZ.1.07/2.3.00/20.0060 co-financed by the European Social Fund and Czech Ministry of Education. L.M. would like to acknowledge the Project No. P205/12/0694 of GAČR.en
dc.description.abstractWe address an open question about the existence of entangled continuous- variable (CV) Werner states with positive partial transpose (PPT). We prove that no such state exists by showing that all PPT CV Werner states are separable. The separability follows by observing that these CV Werner states can be approximated by truncating the states into a finite-dimensional convex mixture of product states. In addition, the constituents of the product states comprise a generalized non-Gaussian measurement which gives, rather surprisingly, a strictly tighter upper bound on quantum discord than photon counting. These results uncover the presence of only negative partial transpose entanglement and illustrate the complexity of more general nonclassical correlations in this paradigmatic class of genuine non-Gaussian quantum states.
dc.format.extent8
dc.format.extent191389
dc.language.isoeng
dc.relation.ispartofPhysical Review. A, Atomic, molecular, and optical physicsen
dc.subjectSeparability criterionen
dc.subjectQuantum nonlocalityen
dc.subjectDiscorden
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleNonexistence of entangled continuous-variable Werner states with positive partial transposeen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doihttps://doi.org/10.1103/PhysRevA.89.032315
dc.description.statusPeer revieweden


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