title: Quantum-enhanced micromechanical displacement sensitivity.
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.
authors: Department of Physics, Technical University of Denmark, Lyngby 2800 Kgs., Denmark. ulrich.hoff@fysik.dtu.dk
authors: Ulrich B
authors: UB
authors: Hoff
authors: Glen I
authors: GI
authors: Harris
authors: Lars S
authors: LS
authors: Madsen
authors: Hugo
authors: H
authors: Kerdoncuff
authors: Mikael
authors: M
authors: Lassen
authors: Bo M
authors: BM
authors: Nielsen
authors: Warwick P
authors: WP
authors: Bowen
authors: Ulrik L
authors: UL
authors: Andersen