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Opt Lett. 2013 May 1;38(9):1413-5. doi: 10.1364/OL.38.001413.

Quantum-enhanced micromechanical displacement sensitivity.

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  • 1Department of Physics, Technical University of Denmark, Lyngby 2800 Kgs., Denmark. ulrich.hoff@fysik.dtu.dk


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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