Optical Entanglement Facilitated by Opto-Mechanical Cooling

TL;DR

This paper presents a theoretical study showing that optomechanical systems can generate robust optical entanglement at ambient conditions by engineering the optical cooling rate, overcoming thermal noise limitations.

Contribution

It introduces a novel configuration of a high-finesse cavity with three optical modes enabling persistent entanglement despite thermal noise.

Findings

Entanglement persists at high thermal quanta with proper cooling.

The system operates effectively in the resolved-sideband regime.

Robust entanglement is feasible under ambient conditions.

Abstract

Optomechanical generation of entangled optical beams is usually hindered by thermal noise. We present a theoretical study of low frequency entanglement generation between two optical harmonics emitted from a cavity optomechanical system operating in the resolved-sideband regime. The system comprises three nearly equidistant optical modes in a high-finesse cavity, with the central mode coherently driven. This configuration enables radiation-pressure interactions that generate strong quantum correlations between the two sideband modes. Remarkably, these correlations persist even at large numbers of thermal quanta if one properly engineers the optical cooling rate of the mechanical mode. Our findings demonstrate the feasibility of robust entanglement under ambient conditions, opening new avenues for hybrid quantum technologies based on mechanical interfaces and continuous-variable quantum information processing.