States of an Ensemble of Two-Level Atoms with Reduced Quantum Uncertainty
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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.
Date issued
2010-02Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
0031-9007