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dc.contributor.authorWang, Jinen_US
dc.contributor.authorWiseman, Howarden_US
dc.contributor.authorMilburn, Gerarden_US
dc.date.accessioned2017-04-24T10:41:22Z
dc.date.available2017-04-24T10:41:22Z
dc.date.issued2001en_US
dc.date.modified2009-12-01T05:29:58Z
dc.identifier.issn03010104en_US
dc.identifier.doi10.1016/S0301-0104(01)00304-4en_AU
dc.identifier.urihttp://hdl.handle.net/10072/3725
dc.description.abstractQuantum feedback can stabilize a two-level atom against decoherence (spontaneous emission), putting it into an arbitrary (specified) pure state. This requires perfect homodyne detection of the atomic emission, and instantaneous feedback. Inefficient detection was considered previously by two of us. Here we allow for a non-zero delay time t in the feedback circuit. Because a two-level atom is a non-linear optical system, an analytical solution is not possible. However, quantum trajectories allow a simple numerical simulation of the resulting non-Markovian process. We find the effect of the time delay to be qualitatively similar to that of inefficient detection. The solution of the non-Markovian quantum trajectory will not remain fixed, so that the time-averaged state will be mixed, not pure. In the case where one tries to stabilize the atom in the excited state, an approximate analytical solution to the quantum trajectory is possible. The result, that the purity (P=2Tr[?2]-1) of the average state is given by P=1-4?t (where ? is the spontaneous emission rate) is found to agree very well with the numerical results.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent339473 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherNorth-Hollanden_US
dc.publisher.placeNetherlandsen_US
dc.publisher.urihttp://www.elsevier.com/wps/find/journaldescription.cws_home/505699/description#descriptionen_AU
dc.relation.ispartofpagefrom221en_US
dc.relation.ispartofpageto235en_US
dc.relation.ispartofedition-en_US
dc.relation.ispartofissue-en_US
dc.relation.ispartofjournalChemical Physicsen_US
dc.relation.ispartofvolume268en_US
dc.subject.fieldofresearchcode240201en_US
dc.titleNon-Markovian homodyne-mediated feedback on a two-level atom: a quantum trajectory treatmenten_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith Institute for Drug Discoveryen_US
gro.rights.copyrightCopyright 2001 Elsevier. 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_AU
gro.date.issued2001
gro.hasfulltextFull Text


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