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dc.contributor.authorSudhir, Ven
dc.contributor.authorWilson, DJen
dc.contributor.authorSchilling, Ren
dc.contributor.authorSchuetz, Hen
dc.contributor.authorFedorov, SAen
dc.contributor.authorGhadimi, AHen
dc.contributor.authorNunnenkamp, Andreasen
dc.contributor.authorKippenberg, TJen
dc.date.accessioned2017-02-13T12:20:25Z
dc.date.available2017-02-13T12:20:25Z
dc.date.issued2017-01-06en
dc.identifier.issn2160-3308
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/262474
dc.description.abstractQuantum correlations between imprecision and backaction are a hallmark of continuous linear measurements. Here, we study how measurement-based feedback can be used to improve the visibility of quantum correlations due to the interaction of a laser field with a nanomechanical oscillator. Backaction imparted by the meter laser, due to radiation-pressure quantum fluctuations, gives rise to correlations between its phase and amplitude quadratures. These quantum correlations are observed in the experiment both as squeezing of the meter field fluctuations below the vacuum level in a homodyne measurement and as sideband asymmetry in a heterodyne measurement, demonstrating the common origin of both phenomena. We show that quantum feedback, i.e., feedback that suppresses measurement backaction, can be used to increase the visibility of the sideband asymmetry ratio. In contrast, by operating the feedback loop in the regime of noise squashing, where the in-loop photocurrent variance is reduced below the vacuum level, the visibility of the sideband asymmetry is reduced. This is due to backaction arising from vacuum noise in the homodyne detector. These experiments demonstrate the possibility, as well as the fundamental limits, of measurement-based feedback as a tool to manipulate quantum correlations.
dc.description.sponsorshipResearch is funded by an ERC Advanced Grant (QuREM), a Marie Curie Initial Training Network Cavity Quantum Optomechanics, the Swiss National Science Foundation, and through support from the NCCR of Quantum Engineering (QSIT). D. J. W. acknowledges support from the European Commission through a Marie Curie Fellowship (IIF Project No. 331985).
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleAppearance and Disappearance of Quantum Correlations in Measurement-Based Feedback Control of a Mechanical Oscillatoren
dc.typeArticle
prism.endingPage14
prism.issueIdentifier1en
prism.number011001en
prism.publicationDate2017en
prism.publicationNamePhysical Review Xen
prism.startingPage1
prism.volume7en
dc.identifier.doi10.17863/CAM.7737
dcterms.dateAccepted2016-11-18en
rioxxterms.versionofrecord10.1103/PhysRevX.7.011001en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2017-01-06en
dc.contributor.orcidNunnenkamp, Andreas [0000-0003-2390-7636]
dc.identifier.eissn2160-3308
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idRoyal Society (uf130303)


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International