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dc.contributor.authorBerry, D.en_US
dc.contributor.authorWiseman, Howarden_US
dc.contributor.authorBreslin, J.en_US
dc.contributor.editorBernd Crasemannen_US
dc.date.accessioned2017-05-03T13:32:01Z
dc.date.available2017-05-03T13:32:01Z
dc.date.issued2001en_US
dc.date.modified2007-07-02T01:57:26Z
dc.identifier.issn10502947en_US
dc.identifier.urihttp://hdl.handle.net/10072/3791
dc.description.abstractWe derive optimal N-photon two-mode input states for interferometric phase measurements. Under canonical measurements the phase variance scales as N-2 for these states, as compared to N-1 or N-1/2 for states considered by previous authors. We prove that it is not possible to realize the canonical measurement by counting photons in the outputs of the interferometer, even if an adjustable auxiliary phase shift is allowed in the interferometer. However, we introduce a feedback algorithm based on Bayesian inference to control this auxiliary phase shift. This makes the measurement close to a canonical one, with a phase variance scaling slightly above N-2. With no feedback, the best result (given that the phase to be measured is completely unknown) is a scaling of N-1. For optimal input states having up to four photons, our feedback scheme is the best possible one, but for higher photon numbers more complicated schemes perform marginally better.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherAmerican Physical Societyen_US
dc.publisher.placeUSAen_US
dc.publisher.urihttp://prola.aps.org/abstract/PRA/v63/i5/e053804en_AU
dc.relation.ispartofpagefrom053804.1en_US
dc.relation.ispartofpageto053804.11en_US
dc.relation.ispartofissue5en_US
dc.relation.ispartofjournalPhysical Review A: Atomic, Molecular and Optical Physicsen_US
dc.relation.ispartofvolume63en_US
dc.subject.fieldofresearchcode240201en_US
dc.titleOptimal input states and feedback for interferometric phase estimationen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2001 American Physical Society. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.en_AU
gro.date.issued2001
gro.hasfulltextNo Full Text


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