Article,

Quantum-enhanced micromechanical displacement sensitivity

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Opt. Lett., 38 (9): 1413--1415 (May 1, 2013)
DOI: 10.1364/ol.38.001413

Abstract

We report on a hitherto unexplored application of squeezed light: for quantum-enhancement of mechanical transduction sensitivity in microcavity optomechanics. Using a toroidal silica microcavity, we experimentally demonstrate measurement of the transduced phase modulation signal in the frequency range 4–5.8 MHz with a sensitivity −0.72(±0.01)  dB below the shot noise level. This is achieved for resonant probing in the highly undercoupled regime, by preparing the probe in a weak coherent state with phase squeezed vacuum states at sideband frequencies.

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