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dc.contributor.authorSchleier-Smith, Monika Helene
dc.contributor.authorLeroux, Ian Daniel
dc.contributor.authorVuletic, Vladan
dc.date.accessioned2010-03-18T20:26:22Z
dc.date.available2010-03-18T20:26:22Z
dc.date.issued2009-08
dc.date.submitted2009-08
dc.identifier.issn0277-786X
dc.identifier.otherSPIE CID: 743107-10
dc.identifier.urihttp://hdl.handle.net/1721.1/52734
dc.description.abstractAtomic clocks have reached the Standard Quantum Limit (SQL) of precision,1 set by the projection noise inherent in measurements on uncorrelated atoms. It is possible to overcome this limit by entangling the atoms to generate a "squeezed state" of the atomic ensemble. We use the collective interaction of an atomic ensemble with a far-detuned light field in an optical resonator to prepare squeezed states by two different methods: quantum non-demolition (QND) measurement and Hamiltonian evolution. We apply both methods to an ensemble of 5 x 10[superscript 4] [superscript 87]Rb atoms in a superposition of hyperfine clock states. We measure the suppression of projection noise and compare it to the accompanying reduction in signal, thereby quantifying the net gain in spectroscopic sensitivity. By QND measurement, with resolution up to 9 dB below the projection noise level, we achieve 3.0(8) dB of metrologically relevant squeezing. Whereas the measurement-based approach relies on knowledge of the (randomly distributed) measurement outcome to produce a conditionally squeezed state, the method of Hamiltonian evolution produces a known squeezed state independent of detector performance. We mimic the dynamics of the one-axis twisting Hamiltonian, proposed as a generator of squeezed states by Kitagawa and Ueda, by using the atom-induced frequency shift of the resonator mode and the corresponding resonator-field-induced shift of the atomic transition frequency to introduce an effective interaction among the atoms. The resulting deterministic squeezing is sufficient to allow a 6.0(4) dB improvement in spectroscopic sensitivity over the SQLen
dc.description.sponsorshipNational Science Foundation, Center for Ultracold Atomsen
dc.description.sponsorshipDefense Advanced Research Projects Agencyen
dc.description.sponsorshipNational Science Foundationen
dc.language.isoen_US
dc.publisherSociety of Photo-optical Instrumentation Engineersen
dc.relation.isversionofhttp://dx.doi.org/10.1117/12.828171en
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en
dc.sourceSPIEen
dc.titlePreparation of reduced-quantum-uncertainty input states for an atomic clocken
dc.typeArticleen
dc.identifier.citationSchleier-Smith, M. H., I. D. Leroux, and V. Vuletic. “Preparation of reduced-quantum-uncertainty input states for an atomic clock.” Time and Frequency Metrology II. Ed. Tetsuya Ido & Derryck T. Reid. San Diego, CA, USA: SPIE, 2009. 743107-10. © 2009 SPIEen
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMassachusetts Institute of Technology. Research Laboratory of Electronicsen_US
dc.contributor.approverVuletic, Vladan
dc.contributor.mitauthorSchleier-Smith, Monika Helene
dc.contributor.mitauthorLeroux, Ian Daniel
dc.contributor.mitauthorVuletic, Vladan
dc.relation.journalProceedings of SPIE--the International Society for Optical Engineeringen
dc.eprint.versionFinal published versionen
dc.type.urihttp://purl.org/eprint/type/JournalArticleen
eprint.statushttp://purl.org/eprint/status/PeerRevieweden
dspace.orderedauthorsSchleier-Smith, M. H.; Leroux, I. D.; Vuleti, V.en
dc.identifier.orcidhttps://orcid.org/0000-0002-9786-0538
mit.licensePUBLISHER_POLICYen
mit.metadata.statusComplete


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