Strong mechanical squeezing in a standard optomechanical system by pump modulation

TL;DR

This paper presents a simple, effective method for achieving strong mechanical squeezing in standard optomechanical systems through pump modulation, surpassing 3 dB without additional techniques, and demonstrating robustness at high temperatures.

Contribution

The authors introduce a pump modulation scheme that enables strong mechanical squeezing beyond 3 dB in standard optomechanical systems, avoiding complex control methods.

Findings

Achieves >3 dB mechanical squeezing via pump modulation.

Squeezing depends on the ratio of sideband strengths, not just optomechanical coupling.

Robust squeezing persists at high bath temperatures.

Abstract

Being beneficial for the amplitude modulation of the pump laser, we propose a simple yet surprisingly effective mechanical squeezing scheme in a standard optomechanical system. By merely introducing a specific kind of periodic modulation into the single-tone driving field to cool down the mechanical Bogoliubov mode, the far beyond 3-dB strong mechanical squeezing can be engineered without requiring any additional techniques. Specifically, we find that the amount of squeezing is not simply dependent on the order of magnitude of the effective optomechanical coupling but strongly on the ratio of sideband strengths for it. To maximize the mechanical squeezing, we numerically and analytically optimize this ratio in the steady-state regime, respectively. The mechanical squeezing engineered in our scheme also has strong robustness and can survive at a high bath temperature. Compared with previous schemes based on the two-tone pump technique, our scheme involves fewer external control laser source and can be extended to other quantum systems to achieve strong squeezing effect.