Ground-State Cooling in Cavity Optomechanics with Unresolved Sidebands

TL;DR

This paper investigates ground-state cooling of a mechanical resonator in cavity optomechanics within the unresolved sideband regime, demonstrating that including antiresonant terms enhances cooling by generating squeezed fields.

Contribution

It introduces an analytic framework for ground-state cooling considering antiresonant terms, showing their role in generating squeezing and improving cooling performance.

Findings

Including antiresonant terms improves cooling efficiency.

Squeezed fields are generated, aiding in cooling enhancement.

Analytic predictions match numerical simulations.

Abstract

We consider a simple cavity optomechanics and study the ground-state cooling of mechanical resonator in the quantum regime. Using the effective master equations in the linear regime, the equations of motion can be obtained for the second order moments. The steady state solutions are derived in the case where the antiresonant terms are ignored. The final mean value of phonon number is compared to the case where the antiresonant terms are included. We find that the ground-state cooling in the last case is improved. Indeed, the inclusion of the antiresonant terms makes the system able to generate a squeezed field, which is required for enhancing cooling. The variances of the resultant field are presented. Analytic calculations are presented in some appropriate regimes. Then our analytic predictions are confirmed with numerical calculations.