Significant enhancement in refrigeration and entanglement in auxiliary-cavity-assisted optomechanical systems

TL;DR

This paper demonstrates how coupling an auxiliary cavity to an optomechanical system significantly boosts quantum refrigeration and entanglement, offering improved noise tolerance and control over quantum states.

Contribution

It introduces an auxiliary-cavity-assisted mechanism that enhances refrigeration and entanglement, providing analytical and numerical insights into optimal conditions and noise resilience.

Findings

Giant amplification in refrigeration rate.

Enhanced noise-tolerant entanglement.

Generation of tripartite entanglement among photons and phonons.

Abstract

We propose how to achieve significantly enhanced quantum refrigeration and entanglement by coupling a pumped auxiliary cavity to an optomechanical cavity. We obtain both analytical and numerical results, and find optimal-refrigeration and -entanglement conditions under the auxiliary-cavity-assisted (ACA) mechanism. Our method leads to a giant amplification in the net refrigeration rate, and reveals that the ACA entanglement has a much stronger noise-tolerant ability in comparison with the unassisted case. By appropriately designing the ACA mechanism, an effective mechanical susceptibility can be well adjusted, and a genuine tripartite entanglement of cooling-cavity photons, auxiliary-cavity photons, and phonons could be generated. Specifically, we show that both optomechanical refrigeration and entanglement can be greatly enhanced for the blue-detuned driving of the auxiliary cavity but suppressed for the red-detuned case. Our work paves a way towards further quantum control of macroscopic mechanical systems and the enhancement and protection of fragile quantum resources.