Ulrich B. Hoff, Glen I. Harris, Lars S. Madsen, Hugo Kerdoncuff, Mikael Lassen, Bo M. Nielsen, Warwick P. Bowen, Ulrik L. Andersen
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 with a sensitivity $-0.72(\pm 0.01)$\,dB below the shot noise level. This is achieved for resonant probing in the highly under-coupled regime, by preparing the probe in a weak coherent state with phase squeezed vacuum states at sideband frequencies.
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http://arxiv.org/abs/1302.0867
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