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dc.contributor.authorWarszawski, P
dc.contributor.authorGambetta, J
dc.contributor.authorWiseman, HM
dc.date.accessioned2017-05-03T11:51:09Z
dc.date.available2017-05-03T11:51:09Z
dc.date.issued2004
dc.date.modified2009-10-12T23:14:45Z
dc.identifier.issn1050-2947
dc.identifier.doi10.1103/PhysRevA.69.042104
dc.identifier.urihttp://hdl.handle.net/10072/5727
dc.description.abstractWe investigate the effect of imperfections in realistic detectors upon the problem of quantum state and parameter estimation by continuous monitoring of an open quantum system. Specifically, we have reexamined the system of a two-level atom with an unknown Rabi frequency introduced by Gambetta and Wiseman [Phys. Rev. A 64, 042105 (2001)]. We consider only direct photodetection and use the realistic quantum trajectory theory reported by Warszawski, Wiseman, and Mabuchi [Phys. Rev. A 65, 023802 (2002)]. The most significant effect comes from a finite bandwidth, corresponding to an uncertainty in the response time of the photodiode. Unless the bandwidth is significantly greater than the Rabi frequency, the observer's ability to obtain information about the unknown Rabi frequency, and about the state of the atom, is severely compromised. This result has implications for quantum control in the presence of unknown parameters for realistic detectors, and even for ideal detectors, as it implies that most of the information in the measurement record is contained in the precise timing of the detections.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent643511 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.publisher.placeUSA
dc.publisher.urihttp://pra.aps.org/
dc.relation.ispartofpagefrom042104.1
dc.relation.ispartofpageto042104.8
dc.relation.ispartofjournalPhysical Review A
dc.relation.ispartofvolume69
dc.subject.fieldofresearchMathematical sciences
dc.subject.fieldofresearchPhysical sciences
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchcode49
dc.subject.fieldofresearchcode51
dc.subject.fieldofresearchcode34
dc.titleDynamical parameter estimation using realistic photodetection
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2004 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's website for access to the definitive, published version.
gro.date.issued2004
gro.hasfulltextFull Text
gro.griffith.authorWiseman, Howard M.


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