Friday, April 26, 2013

1304.6779 (Steven K. Steinke et al.)

Optomechanical back-action evading measurement without parametric
instability
   [PDF]

Steven K. Steinke, Pierre Meystre, Keith C. Schwab
We review a scheme for performing a back-action evading measurement of one mechanical quadrature in an optomechanical setup. The experimental application of this scheme has been limited by parametric instabilities caused in general by a slight dependence of the mechanical frequency on the electromagnetic energy in the cavity. We find that a simple modification to the optical drive can effectively eliminate the parametric instability even at high intracavity power, allowing realistic devices to achieve sub-zero-point uncertainties in the measured quadrature.
View original: http://arxiv.org/abs/1304.6779

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