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dc.contributor.authorOxtoby, Neilen_US
dc.contributor.authorSun, He-Bien_US
dc.contributor.authorWiseman, Howarden_US
dc.contributor.editorA M Stonehamen_US
dc.date.accessioned2017-04-24T11:44:44Z
dc.date.available2017-04-24T11:44:44Z
dc.date.issued2003en_US
dc.date.modified2009-10-12T23:13:14Z
dc.identifier.issn09538984en_US
dc.identifier.doi10.1088/0953-8984/15/46/020en_AU
dc.identifier.urihttp://hdl.handle.net/10072/6352
dc.description.abstractWe propose a model for non-ideal monitoring of the state of a coupled quantum dot qubit by a quantum tunnelling device. The non-ideality is modelled using an equivalent measurement circuit. This allows realistically available measurement results to be related to the state of the quantum system (qubit). We present a quantum trajectory that describes the stochastic evolution of the qubit state conditioned by tunnelling events (i.e. current) through the device. We calculate and compare the noise power spectra of the current in an ideal and a non-ideal measurement. The results show that when the two qubit dots are strongly coupled the non-ideal measurement cannot detect the qubit state precisely. The limitation of the ideal model for describing a realistic system may be estimated from the noise spectra.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent241793 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherInstitute of Physics Publishingen_US
dc.publisher.placeUnited Kingdomen_US
dc.publisher.urihttp://www.iop.org/en_AU
dc.relation.ispartofpagefrom8055en_US
dc.relation.ispartofpageto8064en_US
dc.relation.ispartofjournalJournal of Physics: Condensed Matteren_US
dc.relation.ispartofvolume15en_US
dc.subject.fieldofresearchcode240201en_US
dc.titleNon-ideal monitoring of a qubit state using a quantum tunnelling deviceen_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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