States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty
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Schleier-Smith-2010-States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty.pdf
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Author(s)
Schleier-Smith, Monika Helene
Leroux, Ian Daniel
Vuletic, Vladan
Date Issued
February 2010
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Schleier-Smith, Monika H., Ian D. Leroux, and Vladan Vuletić. “States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty.” Physical Review Letters 104.7 (2010): 073604. © 2010 The American Physical Society
Version
Final published version
Abstract
We generate entangled states of an ensemble of 5×10[superscript 4] [superscript 87]Rb atoms by optical quantum nondemolition measurement. The resonator-enhanced measurement leaves the atomic ensemble, prepared in a superposition of hyperfine clock levels, in a squeezed spin state. By comparing the resulting reduction of quantum projection noise [up to 8.8(8) dB] with the concomitant reduction of coherence, we demonstrate a clock input state with spectroscopic sensitivity 3.0(8) dB beyond the standard quantum limit.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article 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.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.104.073604
