Suppressing Recoil Heating in Levitated Optomechanics using Squeezed Light

TL;DR

This paper demonstrates theoretically that using squeezed light can significantly suppress recoil heating in levitated optomechanics, enhancing quantum control and measurement precision.

Contribution

It introduces a method to arbitrarily suppress recoil heating via squeezed light, improving quantum measurement and feedback cooling in levitated optomechanics.

Findings

Recoil heating can be reduced by at least 60% with current squeezed light sources.

Recoil heating can be reduced by 98% with mode-matched squeezing.

Optical detection beyond the standard quantum limit is achievable.

Abstract

We theoretically show that laser recoil heating in free-space levitated optomechanics can be arbitrarily suppressed by shining squeezed light onto an optically trapped nanoparticle. The presence of squeezing modifies the quantum electrodynamical light-matter interaction in a way that enables us to control the amount of information that the scattered light carries about a given mechanical degree of freedom. Moreover, we analyze the trade-off between measurement imprecision and back-action noise and show that optical detection beyond the standard quantum limit can be achieved. We predict that, with state-of-the-art squeezed light sources, laser recoil heating can be reduced by at least 60% by squeezing a single Gaussian mode with an appropriate incidence direction, and by 98% by squeezing a properly mode-matched mode. Our results, which are valid both for motional and librational degrees of freedom, will lead to improved feedback cooling schemes as well as boost the coherence time of optically levitated nanoparticles in the quantum regime.