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dc.contributor.authorCombes, Joshuaen_US
dc.contributor.authorWiseman, Howarden_US
dc.date.accessioned2017-05-03T11:51:31Z
dc.date.available2017-05-03T11:51:31Z
dc.date.issued2011en_US
dc.date.modified2012-06-11T22:39:18Z
dc.identifier.issn09534075en_US
dc.identifier.doi10.1088/0953-4075/44/15/154008en_US
dc.identifier.urihttp://hdl.handle.net/10072/42682
dc.description.abstractQuantum feedback control protocols can improve the operation of quantum devices. Here we examine the performance of a purification protocol when there are imperfections in the controls. The ideal feedback protocol produces an x-eigenstate from a mixed state in the minimum time, and is known as rapid state preparation. The imperfections we examine include time delays in the feedback loop, finite strength feedback, calibration errors and inefficient detection. We analyse these imperfections using the Wiseman-Milburn feedback master equation and related formalism. We find that the protocol is most sensitive to time delays in the feedback loop. For systems with slow dynamics, however, our analysis suggests that inefficient detection would be the bigger problem. We also show how system imperfections, such as dephasing and damping, can be included in a model via the feedback master equation.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent691242 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherInstitute of Physics Publishing Ltd.en_US
dc.publisher.placeUnited Kingdomen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom154008-1en_US
dc.relation.ispartofpageto154008-8en_US
dc.relation.ispartofissue15en_US
dc.relation.ispartofjournalJournal of Physics Ben_US
dc.relation.ispartofvolume44en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchQuantum Information, Computation and Communicationen_US
dc.subject.fieldofresearchQuantum Opticsen_US
dc.subject.fieldofresearchQuantum Physics not elsewhere classifieden_US
dc.subject.fieldofresearchcode020603en_US
dc.subject.fieldofresearchcode020604en_US
dc.subject.fieldofresearchcode020699en_US
dc.titleQuantum feedback for rapid state preparation in the presence of control imperfectionsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2011 Institute of Physics Publishing. 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.en_US
gro.date.issued2011
gro.hasfulltextFull Text


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