Ground-state cooling of multiple near-degenerate mechanical modes

TL;DR

This paper introduces a feasible method to cool multiple near-degenerate mechanical modes to their ground state using multiple optical modes, overcoming dark mode limitations and enabling scalable quantum state manipulation.

Contribution

It presents a novel approach employing multiple optical modes to achieve simultaneous ground-state cooling of multiple mechanical modes, overcoming dark mode interference.

Findings

Successful ground-state cooling of multiple modes demonstrated

The scheme is scalable and adaptable to realistic systems

Optical mode distinguishability is critical for efficiency

Abstract

We propose a general and experimentally feasible approach to realize simultaneous ground-state cooling of arbitrary number of near-degenerate, or even fully degenerate mechanical modes, overcoming the limit imposed by the formation of mechanical dark modes. Multiple optical modes are employed to provide different dissipation channels that prevent complete destructive interference of the cooling pathway, and thus eliminating the dark modes. The cooling rate and limit are explicitly specified, in which the distinguishability of the optical modes to the mechanical modes is found to be critical for an efficient cooling process. In a realistic multi-mode optomechanical system, ground-state cooling of all mechanical modes is demonstrated by sequentially introducing optical drives, proving the feasibility and scalability of the proposed scheme. The work may provide new insights in preparing and manipulating multiple quantum states in macroscopic systems.