Enhancing the force sensitivity of squeezed light optomechanical interferometer

TL;DR

This paper proposes a method to improve the force sensitivity of optomechanical interferometers beyond the standard quantum limit by combining squeezed light with quantum optical restoring force, applicable at low frequencies.

Contribution

It introduces a novel approach that enhances sensitivity beyond existing methods by integrating squeezed light and quantum restoring force, extending the capabilities of optomechanical sensors.

Findings

Sensitivity improved by a factor of fective in low-frequency regime

Method surpasses standard quantum limit with specific parameter conditions

Applicable to frequencies much lower than the mirror resonance frequency

Abstract

Application of frequency-dependent squeezed vacuum improves the force sensitivity of optomechanical interferometer beyond the standard quantum limit by a factor of $e^{-r}$, where $r$ is the squeezing parameter. In this work, we show that the application of squeezed light along with quantum optical restoring force can enhance the sensitivity beyond the standard quantum limit by a factor of $\sqrt{e^{-2r}\zeta/4\Delta}$, where $0< \zeta/\Delta <1$, with $\zeta$ as the optomechanical cavity decay rate and $\Delta$ as the detuning between cavity eigenfrequency and driving field. The technique described in this article is restricted to frequencies much smaller than the resonance frequency of the optomechanical mirror.