Fast ground-state cooling of mechanical resonator with time-dependent optical cavities

TL;DR

This paper presents a practical method for rapidly cooling a mechanical resonator to its ground state using a three-mirror cavity system with controllable optical drives, bypassing the resolved sideband requirement.

Contribution

It introduces a novel scheme leveraging time-dependent optical drives and the Born-Oppenheimer approximation for efficient ground-state cooling in optomechanical systems.

Findings

Achieves ground-state cooling without resolved sideband condition.

Demonstrates control of effective frequency via optical drives.

Provides a feasible scheme for fast cooling in three-mirror cavities.

Abstract

We propose a feasible scheme to cool down a mechanical resonator (MR) in a three-mirror cavity optomechanical system with controllable external optical drives. Under the Born-Oppenheimer (BO) approximation, the whole dynamics of the mechanical resonator and cavities is reduced to that of a time-dependent harmonic oscillator, whose effective frequency can be controlled through the optical driving fields. The fast cooling of the MR can be realized by controlling the amplitude of the optical drives. Significantly, we further show that the ground-state cooling may be achieved via the three-mirror cavity optomechanical system without the resolved sideband condition.