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dc.contributor.authorWhite, GA
dc.contributor.authorVaccaro, JA
dc.contributor.authorWiseman, HM
dc.date.accessioned2017-05-03T11:16:27Z
dc.date.available2017-05-03T11:16:27Z
dc.date.issued2009
dc.date.modified2009-09-11T04:58:52Z
dc.identifier.issn1050-2947
dc.identifier.doi10.1103/PhysRevA.79.032109
dc.identifier.urihttp://hdl.handle.net/10072/25626
dc.description.abstractGlobal conservation laws imply superselection rules (SSRs) which restrict the operations that are possible on any given state. Imposing the additional constraint of local operations and classical communication forbids the transfer of quantum systems between spatially separated sites. In the case of particle conservation this imposes a SSR for local particle number. That is, the coherences between subspaces of fixed particle number at each site are not accessible and any state is therefore equivalent to its projection onto these subspaces. The accessible entanglement under the SSR is less than (or equal to) that available in the absence of the SSR. An ancilla can be used as a reference system to increase the amount of accessible entanglement. We examine the relationship between local-particle-number uncertainty and the accessible entanglement and consider the optimal reference states for recovering entanglement from certain systems. In particular we derive the optimal ancilla state for extracting entanglement for a single-shared particle and make steps toward the optimum for general systems. We also show that a reference for phase angle is fundamentally different to a reference for the SSR associated with particle conservation.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent253790 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.publisher.placeRidge, NY
dc.publisher.urihttp://pra.aps.org/
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom032109-1
dc.relation.ispartofpageto032109-13
dc.relation.ispartofjournalPhysical Review A (Atomic, Molecular and Optical Physics)
dc.relation.ispartofvolume79
dc.rights.retentionY
dc.subject.fieldofresearchMathematical sciences
dc.subject.fieldofresearchPhysical sciences
dc.subject.fieldofresearchQuantum information, computation and communication
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchcode49
dc.subject.fieldofresearchcode51
dc.subject.fieldofresearchcode510803
dc.subject.fieldofresearchcode34
dc.titleOptimal reference states for maximum accessible entanglement under the local-particle-number superselection rule
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2008 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
gro.date.issued2009
gro.hasfulltextFull Text
gro.griffith.authorVaccaro, Joan A.
gro.griffith.authorWiseman, Howard M.


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