Squeezing of the mechanical motion and beating 3 dB limit using dispersive optomechanical interactions
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We study an optomechanical system consisting of an optical cavity and movable mirror coupled through dispersive linear optomechanical coupling (LOC) and quadratic optomechanical coupling (QOC). We work in the resolved side band limit with a high quality factor mechanical oscillator in a strong coupling regime. We show that the presence of QOC in the conventional optomechanical system (with LOC alone) modifies the mechanical oscillator’s frequency and reduces the back-action effects on mechanical oscillator. As a result of this the fluctuations in mechanical oscillator can be suppressed below standard quantum limit thereby squeeze the mechanical motion of resonator. We also show that either of the quadratures can be squeezed depending on the sign of the QOC. With detailed numerical calculations and analytical approximation we show that in such systems, the 3 dB limit can be beaten.
Journal of Modern Optics
© 2016 Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Modern Optics on 20 Dec 2016, available online: https://doi.org/10.1080/09500340.2016.1266051
This publication has been entered into Griffith Research Online as an Advanced Online Version.
Quantum Physics not elsewhere classified