Improving Cooling performance of the mechanical resonator with the two-level-system defects

TL;DR

This paper proposes a pulse sequence method to enhance the cooling efficiency of mechanical resonators containing defects, overcoming limitations of traditional optomechanical cooling techniques.

Contribution

Introduction of a periodic $\sigma_z$ pulse sequence that suppresses defect-bath interactions, significantly improving cooling performance across various defect parameters.

Findings

Enhanced cooling efficiency with $\sigma_z$ pulses

Effective across different defect energy gaps

Robust against varying defect damping rates

Abstract

We study cooling performance of a realistic mechanical resonator containing defects. The normal cooling method through an optomechanical system does not work efficiently due to those defects. We show by employing periodical $\sigma_z$ pulses, we can eliminate the interaction between defects and their surrounded heat baths up to the first order of time. Compared with the cooling performance of no $\sigma_z$ pulses case, much better cooling results are obtained. Moreover, this pulse sequence has an ability to improve the cooling performance of the resonator with different defects energy gaps and different defects damping rates.