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dc.contributor.authorWhite, Grahamen_US
dc.contributor.authorVaccaro, Joanen_US
dc.contributor.authorWiseman, Howarden_US
dc.date.accessioned2017-05-03T11:16:27Z
dc.date.available2017-05-03T11:16:27Z
dc.date.issued2009en_US
dc.date.modified2009-09-11T04:58:52Z
dc.identifier.issn10502947en_US
dc.identifier.doi10.1103/PhysRevA.79.032109en_AU
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.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent253790 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherAmerican Physical Societyen_US
dc.publisher.placeRidge, NYen_US
dc.publisher.urihttp://pra.aps.org/en_AU
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom032109-1en_US
dc.relation.ispartofpageto032109-13en_US
dc.relation.ispartofjournalPhysical Review A (Atomic, Molecular and Optical Physics)en_US
dc.relation.ispartofvolume79en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchQuantum Information, Computation and Communicationen_US
dc.subject.fieldofresearchcode020603en_US
dc.titleOptimal reference states for maximum accessible entanglement under the local-particle-number superselection ruleen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 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.en_AU
gro.date.issued2009
gro.hasfulltextFull Text


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