Squeezing lights via a levitated cavity optomechanics

TL;DR

This paper demonstrates that an optically levitated nano-particle in a bichromatic cavity can generate significant single-mode and two-mode squeezed light at room temperature, surpassing traditional limits and enabling advanced quantum applications.

Contribution

It introduces a novel scheme using a levitated nano-particle in a bichromatic cavity to achieve strong light squeezing through coherent scattering, even in a bad cavity regime at room temperature.

Findings

Single-mode squeezing exceeds 17 dB at room temperature.

Two-mode squeezing can be maximized near the system's stability boundary.

The scheme operates effectively in the bad cavity regime, overcoming thermal noise challenges.

Abstract

Squeezing light is a critical resource in both fundamental physics and precision measurement. The squeezing light has been generated through optical-parametric amplification inside an optical resonator. However, preparing the squeezing light in an optomechanical system is still a challenge for the thermal noise inevitably coupling to the system. We consider an optically levitated nano-particle in a bichromatic cavity, in which two cavity modes could be excited by the scattering photons of the dual-tweezers respectively. Based on the coherent scattering mechanism, the ultra-strong coupling between the cavity field and torsional motion of nano-particle could be achieved for the current experimental conditions. With the back-action of the optically levtiated nano-particle, the broad single-mode squeezing light can be realized in the bad cavity regime. Even at room temperature, the single-mode light can be squeezed for more than 17 dB, which is far beyond the 3 dB limit. The two-mode squeezing lights can also be generated, if the optical tweezers contain two frequencies, one is on the red sideband of the cavity mode, the other is on the blue sideband. The two-mode squeezing can be maximized near the boundary of the system stable regime, and is sensitive to both the cavity decay rate and the power of the optical tweezers.