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dc.contributor.authorWarszawski, Prahladen_US
dc.contributor.authorWiseman, Howarden_US
dc.date.accessioned2017-04-24T08:47:30Z
dc.date.available2017-04-24T08:47:30Z
dc.date.issued2003en_US
dc.date.modified2009-10-08T06:29:30Z
dc.identifier.issn14644266en_US
dc.identifier.doi10.1088/1464-4266/5/1/301en_AU
dc.identifier.urihttp://hdl.handle.net/10072/6306
dc.description.abstractQuantum trajectories describe the stochastic evolution of an open quantum system conditioned on continuous monitoring of its output, such as by an ideal photodetector. In practice an experimenter has access to an output filtered through various electronic devices, rather than the microscopic states of the detector. This introduces several imperfections into the measurement process, of which only inefficiency has previously been incorporated into quantum trajectory theory. However, all electronic devices have finite bandwidths, and the consequent delay in conveying the output signal to the observer implies that the evolution of the conditional state of the quantum system must be non-Markovian. We present a general method of describing this evolution and apply it to avalanche photodiodes and to photoreceivers. We include the effects of efficiency, dead time, bandwidth, electronic noise and dark counts. The essential idea is to treat the quantum system and classical detector jointly, and to average over the latter to obtain the conditional quantum state. The significance of our theory is that quantum trajectories for realistic detection are necessary for sophisticated approaches to quantum feedback, and our approach could be applied in many areas of physics.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent244364 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherInstitute of Physics Publishingen_US
dc.publisher.placeUKen_US
dc.publisher.urihttp://www.iop.org/EJ/journal/JOptBen_AU
dc.relation.ispartofpagefrom1en_US
dc.relation.ispartofpageto14en_US
dc.relation.ispartofjournalJournal of Optics B: Quantum and Semiclassical Opticsen_US
dc.relation.ispartofvolume5en_US
dc.subject.fieldofresearchcode240201en_US
dc.titleQuantum trajectories for realistic photodetection: I. General formalism.en_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2003 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_AU
gro.date.issued2003
gro.hasfulltextFull Text


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