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dc.contributor.authorKroeger, K
dc.contributor.authorDogra, N
dc.contributor.authorRosa-Medina, R
dc.contributor.authorPaluch, M
dc.contributor.authorFerri, F
dc.contributor.authorDonner, T
dc.contributor.authorEsslinger, T
dc.date.accessioned2020-03-25T11:23:10Z
dc.date.available2020-03-25T11:23:10Z
dc.date.issued2020
dc.date.submitted2019-11-29
dc.identifier.issn1367-2630
dc.identifier.othernjpab73cc
dc.identifier.otherab73cc
dc.identifier.othernjp-111379.r1
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/303725
dc.description.abstractWe present an active feedback scheme acting continuously on the state of a quantum gas dispersively coupled to a high-finesse optical cavity. The quantum gas is subject to a transverse pump laser field inducing a self-organization phase transition, where the gas acquires a density modulation and photons are scattered into the resonator. Photons leaking from the cavity allow for a real-time and non-destructive readout of the system. We stabilize the mean intra-cavity photon number through a micro-processor controlled feedback architecture acting on the intensity of the transverse pump field. The feedback scheme can keep the mean intra-cavity photon number $n_\text{ph}$ constant, in a range between $n_\text{ph}=0.17\pm 0.04$ and $n_\text{ph}=27.6\pm 0.5$, and for up to 4 s. Thus we can engage the stabilization in a regime where the system is very close to criticality as well as deep in the self-organized phase. The presented scheme allows us to approach the self-organization phase transition in a highly controlled manner and is a first step on the path towards the realization of many-body phases driven by tailored feedback mechanisms.
dc.languageen
dc.publisherIOP Publishing
dc.rightsAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectPaper
dc.subjectquantum gas
dc.subjectcavity QED
dc.subjectDicke model
dc.subjectphase transition
dc.subjectself-organization
dc.subjectactive feedback
dc.subjectreal-time measurement
dc.titleContinuous feedback on a quantum gas coupled to an optical cavity
dc.typeArticle
dc.date.updated2020-03-25T11:23:10Z
prism.issueIdentifier3
prism.publicationNameNew Journal of Physics
prism.volume22
dc.identifier.doi10.17863/CAM.50804
dcterms.dateAccepted2020-02-05
rioxxterms.versionofrecord10.1088/1367-2630/ab73cc
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidKroeger, K [0000-0003-2374-454X]
dc.contributor.orcidDogra, N [0000-0002-6089-5032]
dc.contributor.orcidRosa-Medina, R [0000-0001-7321-7743]
dc.contributor.orcidFerri, F [0000-0001-7083-4025]
dc.contributor.orcidDonner, T [0000-0001-7016-587X]
dc.identifier.eissn1367-2630
dc.publisher.urlhttp://dx.doi.org/10.1088/1367-2630/ab73cc
pubs.funder-project-idH2020 European Research Council (742579)
pubs.funder-project-idSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (175329, 182650, QSIT NCCR)
cam.issuedOnline2020-03-19


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