Ponderomotive light squeezing with atomic cavity optomechanics

  • Brooks D
  • Botter T
  • Brahms N
 et al. 
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Accessing distinctly quantum aspects of the interaction between light and the position of a mechanical object has been an outstanding challenge to cavity-optomechanical systems. Only cold-atom implementations of cavity optomechanics have indicated effects of the quantum fluctuations in the optical radiation pressure force. Here we use such a system, in which quantum photon-number fluctuations significantly drive the center of mass of an atomic ensemble inside a Fabry-Perot cavity. We show that the optomechanical response both amplifies and ponderomotively squeezes the quantum light field. We also demonstrate that classical optical fluctuations can be attenuated by 26 dB or amplified by 20 dB with a weak input pump power of < 40 pW, and characterize the optomechanical amplifier's frequency-dependent gain and phase response in both the amplitude and phase-modulation quadratures.

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  • Daniel W. C. Brooks

  • Thierry Botter

  • Nathan Brahms

  • Thomas P. Purdy

  • Sydney Schreppler

  • Dan M. Stamper-Kurn

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