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dc.contributor.authorWiseman, Howarden_US
dc.contributor.authorRalph, J.en_US
dc.date.accessioned2017-05-03T11:51:23Z
dc.date.available2017-05-03T11:51:23Z
dc.date.issued2006en_US
dc.date.modified2009-10-08T06:28:06Z
dc.identifier.issn13672630en_US
dc.identifier.doi10.1088/1367-2630/8/6/090en_AU
dc.identifier.urihttp://hdl.handle.net/10072/12363
dc.description.abstractThis paper reconsiders the claimed rapidity of a scheme for the purification of the quantum state of a qubit, proposed recently in Jacobs (2003 Phys. Rev. A 67 030301(R)). The qubit starts in a completely mixed state, and information is obtained by a continuous measurement. Jacobs' rapid purification protocol uses Hamiltonian feedback control to maximize the average purity of the qubit for a given time, with a factor of two increase in the purification rate over the no-feedback protocol. However, by re-examining the latter approach, we show that it minimizes the average time taken for a qubit to reach a given purity. In fact, the average time taken for the no-feedback protocol beats that for Jacobs' protocol by a factor of two. We discuss how this is compatible with Jacobs' result and the usefulness of the different approaches.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.format.extent178884 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/en_AU
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom1en_US
dc.relation.ispartofpageto11en_US
dc.relation.ispartofissue6en_US
dc.relation.ispartofjournalNew Journal of Physicsen_US
dc.relation.ispartofvolume8en_US
dc.rights.retentionYen_AU
dc.subject.fieldofresearchcode240201en_US
dc.titleReconsidering rapid qubit purification by feedbacken_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.description.notepublicPage numbers are not for citation purposes. Instead, this article has the unique article number of 90.en_AU
gro.rights.copyrightCopyright 2006 Institute of Physics. Reproduced in accordance with the copyright policy of the publisher. This journal is available online please use hypertext links.en_AU
gro.date.issued2006
gro.hasfulltextFull Text


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