Hoff, Ulrich Busk1; Harris, Glen I.4; Madsen, Lars Skovgaard1; Kerdoncuff, Hugo1; Lassen, Mikael Østergaard1; Nielsen, Bo Melholt1; Bowen, Warwick P.4; Andersen, Ulrik Lund1
1 Department of Physics, Technical University of Denmark2 Quantum Physics and Information Techology, Department of Physics, Technical University of Denmark3 University of Queensland4 University of Queensland
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.
Optics Letters, 2013, Vol 38, Issue 9, p. 1413-1415