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dc.contributor.authorOxtoby, Neil P
dc.contributor.authorGambetta, Jay
dc.contributor.authorWiseman, HM
dc.contributor.editorP D Adams
dc.date.accessioned2017-05-03T11:43:16Z
dc.date.available2017-05-03T11:43:16Z
dc.date.issued2008
dc.date.modified2009-12-21T03:11:57Z
dc.identifier.issn2469-9950
dc.identifier.doi10.1103/PhysRevB.77.125304
dc.identifier.urihttp://hdl.handle.net/10072/22531
dc.description.abstractThe extension of quantum trajectory theory to incorporate realistic imperfections in the measurement of solid-state qubits is important for quantum computation, particularly for the purposes of state preparation and error correction as well as for readout of computations. Previously this has been achieved for low-frequency (dc) weak measurements. In this paper we extend realistic quantum trajectory theory to include radio frequency (rf) weak measurements where a low-transparency quantum point contact (QPC), coupled to a charge qubit, is used to damp a classical oscillator circuit. The resulting realistic quantum trajectory equation must be solved numerically. We present an analytical result for the limit of large dissipation within the oscillator (relative to the QPC), where the oscillator slaves to the qubit. The rf+dc mode of operation is considered. Here the QPC is biased (dc) as well as subjected to a small-amplitude sinusoidal carrier signal (rf). The rf+dc QPC is shown to be a low-efficiency charge-qubit detector, which may nevertheless be higher than the dc-QPC (which is subject to 1/f noise).
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent214152 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoen_AU
dc.publisherAmerican Physical Society
dc.publisher.placeUnited States
dc.publisher.urihttp://prb.aps.org/
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom125304 -1
dc.relation.ispartofpageto125304 -11
dc.relation.ispartofjournalPhysical Review B (Condensed Matter and Materials Physics)
dc.relation.ispartofvolume77
dc.rights.retentionY
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchChemical Sciences
dc.subject.fieldofresearchcode02
dc.subject.fieldofresearchcode03
dc.titleModel for monitoring of a charge qubit using a radio-frequency quantum point contact including experimental imperfections
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2008 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.issued2008
gro.hasfulltextFull Text
gro.griffith.authorWiseman, Howard M.
gro.griffith.authorOxtoby, Neil P.


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