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dc.contributor.authorChantasri, Areeya
dc.contributor.authorGuevara, Ivonne
dc.contributor.authorWiseman, Howard M
dc.date.accessioned2019-10-30T03:35:34Z
dc.date.available2019-10-30T03:35:34Z
dc.date.issued2019
dc.identifier.issn1367-2630
dc.identifier.doi10.1088/1367-2630/ab396e
dc.identifier.urihttp://hdl.handle.net/10072/388755
dc.description.abstractWe investigate the estimation technique called quantum state smoothing introduced in (Guevara and Wiseman 2015 Phys. Rev. Lett. 115 180407), which offers a valid quantum state estimate for a partially monitored system, conditioned on the observed record both prior and posterior to an estimation time. The technique was shown to give a better estimate of the underlying true quantum states than the usual quantum filtering approach. However, the improvement in estimation fidelity, originally examined for a resonantly driven qubit coupled to two vacuum baths, was also shown to vary depending on the types of detection used for the qubit's fluorescence. In this work, we analyse this variation in a systematic way for the first time. We first define smoothing power using an average purity recovery and a relative average purity recovery, of smoothing over filtering. Then, we explore the power for various combinations of fluorescence detection for both observed and unobserved channels. We next propose a method to explain the variation of the smoothing power, based on multi-time correlation strength between fluorescence detection records. The method gives a prediction of smoothing power for different combinations, which is remarkably successful in comparison with numerically simulated qubit trajectories.
dc.description.sponsorshipGriffith University
dc.languageEnglish
dc.publisherInstitute of Physics Publishing (IOPP)
dc.relation.ispartofissue8
dc.relation.ispartofjournalNew Journal of Physics
dc.relation.ispartofvolume21
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchcode02
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysics, Multidisciplinary
dc.subject.keywordsPhysics
dc.subject.keywordsquantum state estimation
dc.titleQuantum state smoothing: why the types of observed and unobserved measurements matter
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationChantasri, A; Guevara, I; Wiseman, HM, Quantum state smoothing: why the types of observed and unobserved measurements matter, New Journal of Physics, 2019, 21 (8)
dcterms.licensehttps://creativecommons.org/licenses/by/3.0/
dc.date.updated2019-10-30T02:32:02Z
dc.description.versionPublished
gro.rights.copyright© 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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gro.griffith.authorChantasri, Areeya
gro.griffith.authorWiseman, Howard M.
gro.griffith.authorGuevara Prieto, Ivonne A.


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