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dc.contributor.authorOxtoby, NP
dc.contributor.authorSun, HB
dc.contributor.authorWiseman, HM
dc.contributor.editorA M Stoneham
dc.date.accessioned2017-05-03T14:27:07Z
dc.date.available2017-05-03T14:27:07Z
dc.date.issued2003
dc.date.modified2009-10-12T23:13:14Z
dc.identifier.issn0953-8984
dc.identifier.doi10.1088/0953-8984/15/46/020
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.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent241793 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherInstitute of Physics Publishing
dc.publisher.placeUnited Kingdom
dc.publisher.urihttp://www.iop.org/
dc.relation.ispartofpagefrom8055
dc.relation.ispartofpageto8064
dc.relation.ispartofjournalJournal of Physics: Condensed Matter
dc.relation.ispartofvolume15
dc.subject.fieldofresearchCondensed matter physics
dc.subject.fieldofresearchMaterials engineering
dc.subject.fieldofresearchNanotechnology
dc.subject.fieldofresearchcode5104
dc.subject.fieldofresearchcode4016
dc.subject.fieldofresearchcode4018
dc.titleNon-ideal monitoring of a qubit state using a quantum tunnelling device
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 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.
gro.date.issued2003
gro.hasfulltextFull Text
gro.griffith.authorWiseman, Howard M.


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