Mechanical Squeezing in Quadratically-coupled Optomechanical Systems

TL;DR

This paper demonstrates how periodic modulation in a quadratically-coupled dissipative optomechanical system can generate strong mechanical squeezing exceeding the 3-dB limit, even with high thermal phonon occupancy.

Contribution

It introduces a method of using amplitude modulation to enhance mechanical squeezing and cooling in quadratically-coupled optomechanical systems, surpassing previous limits.

Findings

Achieved mechanical squeezing beyond 3 dB standard quantum limit.

Demonstrated ground state cooling of the Bogoliubov mode.

Observed strong optomechanical entanglement at high thermal occupancy.

Abstract

We demonstrate the generation of a strong mechanical squeezing in a dissipative optomechanical system by introducing a periodic modulation in the amplitude of a single-tone laser driving the system. The mechanical oscillator is quadratically coupled to the optical mode, which contributes to a strong squeezing exceeding the 3-dB standard quantum limit. The Bogoliubov mode of the mechanical oscillator also cools down to its ground state due to sideband cooling. We further optimize this ratio of sideband strengths to introduce enhanced squeezing. We also compare our results with the analytical (under adiabatic approximation) and the exact numerical solution. Even for a thermal occupancy of 10^4 phonons, mechanical squeezing beyond 3 dB and a strong optomechanical entanglement is observed.