T. P. Purdy, P. -L. Yu, R. W. Peterson, N. S. Kampel, C. A. Regal
Interferometry is a ubiquitous method for sensitive displacement measurements. In typical interferometry employing a coherent state, the amplitude and phase quantum fluctuations are both at the shot noise level. Recently optomechanical systems have been developed that not only measure mechanical motion, but can also manipulate the motion with radiation pressure. For example, radiation forces have been used to cool mechanical resonators to near their quantum ground state. With sufficiently strong radiation pressure, quantum fluctuations can become the dominant mechanical driving force, leading to correlations between the mechanical motion and the quantum fluctuations of the optical field. Such correlations can be used to suppress fluctuations on an interferometer's output optical field below the shot noise level, at the expense of increasing fluctuations in an orthogonal quadrature. This method of manipulating the quantum fluctuations is termed ponderomotive squeezing. Here, we observe ponderomotive squeezing at 1.7 +/- 0.2 dB below (32% below) the shot noise level and optical amplification of quantum fluctuations by over 25 dB. The squeezing is realized on light transmitted through a Fabry-Perot interferometer with an embedded mechanically compliant dielectric membrane.
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http://arxiv.org/abs/1306.1268
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