Amplifying Two-Mode Squeezing in Nanomechanical Resonators

TL;DR

This paper proposes a scheme to significantly amplify two-mode squeezing in nanomechanical resonators using parametric amplification and two-tone laser controls, enhancing quantum metrology and information processing.

Contribution

The study introduces a novel cooperative mechanism combining laser controls and parametric amplification to boost two-mode squeezing in nanomechanical systems.

Findings

Amplification of two-mode squeezing via laser control and parametric processes.

Enhanced squeezing levels are resilient to thermal noise.

The scheme is effective under realistic experimental conditions.

Abstract

Quantum squeezing plays a crucial role in enhancing the precision of quantum metrology and improving the efficiency of quantum information processing protocols. We thus propose a scheme to amplify two-mode squeezing in nanomechanical resonators, harnessing parametric amplification and two-tone laser controls. The red-detuned laser drives facilitate the cooling of the nanomechanical resonators down to their ground state and allow optimal quantum state transfer in the weak-coupling, resolved sideband regime. In particular, the competing blue-detuned lasers in the driving pairs induce displacement squeezing in mechanical resonators. Thus, the quantum state transfer of the squeezing in nanomechanical resonators and the intracavity correlated photons of the parametric amplifier significantly enhance the two-mode mechanical squeezing. Notably, increasing the coupling strength of the red detuned laser and the ratio of blue-to-red detuned laser dramatically amplifies the two-mode mechanical squeezing under realistic experiment parameters of a typical optomechanical system. Our findings reveal that the proposed cooperative mechanism effectively enhances the level of two-mode mechanical squeezing with a considerable improvement and demonstrates exceptional resilience to thermal noise.