Quantum-enhanced micromechanical displacement sensitivity

Ulrich Busk Hoff, Glen I. Harris, Lars Skovgaard Madsen, Hugo Kerdoncuff, Mikael Østergaard Lassen, Bo Melholt Nielsen, Warwick P. Bowen, Ulrik Lund Andersen

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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.
Original languageEnglish
JournalOptics Letters
Issue number9
Pages (from-to)1413-1415
Publication statusPublished - 2013

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-38-9-1413. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


  • Homodyning
  • Squeezed states
  • Microcavities
  • Optomechanics


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