Resonance-dominant optomechanical entanglement in open quantum systems

TL;DR

This paper demonstrates how a resonance effect, combined with a filtering model, can significantly enhance and protect optomechanical entanglement against thermal noise and damping, with implications for quantum networks.

Contribution

It introduces a novel filtering approach leveraging resonance effects to improve the robustness of optomechanical entanglement in open quantum systems.

Findings

Filtering doubles the robustness of entanglement against thermal noise.

Resonance effects help protect entanglement from decoherence.

Extension to optical cavity arrays shows potential for long-distance quantum communication.

Abstract

Motivated by entanglement protection, our work utilizes a resonance effect to enhance optomechanical entanglement in the coherent-state representation. We propose a filtering model to filter out the significant detuning components between a thermal-mechanical mode and its surrounding heat baths in the weak coupling limit. We reveal that protecting continuous-variable entanglement involves the elimination of degrees of freedom associated with significant detuning components, thereby resisting decoherence. We construct a nonlinear Langevin equation of the filtering model and numerically show that the filtering model doubles the robustness of the stationary maximum optomechanical entanglement to the thermal fluctuation noise and mechanical damping. Furthermore, we generalize these results to an optical cavity array with one oscillating end-mirror to investigate the long-distance optimal optomechanical entanglement transfer. Our study breaks new ground for applying the resonance effect to protect quantum systems from decoherence and advancing the possibilities of large-scale quantum information processing and quantum network construction.