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dc.contributor.authorOxtoby, NP
dc.contributor.authorWarszawski, P
dc.contributor.authorWiseman, HM
dc.contributor.authorSun, HB
dc.contributor.authorPolkinghorne, RES
dc.date.accessioned2017-05-03T11:51:16Z
dc.date.available2017-05-03T11:51:16Z
dc.date.issued2005
dc.date.modified2009-10-12T23:13:58Z
dc.identifier.issn1098-0121
dc.identifier.doi10.1103/PhysRevB.71.165317
dc.identifier.urihttp://hdl.handle.net/10072/4935
dc.description.abstractWe present a new model for the continuous measurement of a coupled quantum dot charge qubit. We model the effects of a realistic measurement, namely adding noise to, and filtering, the current through the detector. This is achieved by embedding the detector in an equivalent circuit for measurement. Our aim is to describe the evolution of the qubit state conditioned on the macroscopic output of the external circuit. We achieve this by generalizing a recently developed quantum trajectory theory for realistic photodetectors [P. Warszawski, H. M. Wiseman, and H. Mabuchi, Phys. Rev. A 65, 023802 (2002)] to treat solid-state detectors. This yields stochastic equations whose (numerical) solutions are the "realistic quantum trajectories" of the conditioned qubit state. We derive our general theory in the context of a low transparency quantum point contact. Areas of application for our theory and its relation to previous work are discussed.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent143802 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.publisher.placeRidge, NY
dc.publisher.urihttps://journals.aps.org/prb/issues/71/16
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom165317.1
dc.relation.ispartofpageto165317.9
dc.relation.ispartofjournalPhysical Review B: Condensed Matter and Materials Physics
dc.relation.ispartofvolume71
dc.rights.retentionY
dc.subject.fieldofresearchPhysical sciences
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchcode51
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode40
dc.titleQuantum trajectories for the realistic measurement of a solid-state charge qubit
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2005 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.issued2005
gro.hasfulltextFull Text
gro.griffith.authorWiseman, Howard M.


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