Robustness of continuous-variable entanglement via geometrical nonlinearity

TL;DR

This paper introduces a scheme leveraging geometrical nonlinearity in optomechanical systems to generate robust continuous-variable entanglement that remains resilient against thermal decoherence at room temperature.

Contribution

It demonstrates that geometrical nonlinearity enhances and shifts the maximum entanglement in optomechanical systems, providing a robust quantum interface.

Findings

Entanglement is enhanced by geometrical nonlinearity.

Maximum entanglement shifts to high detuning values.

Robust entanglement persists at room temperature despite thermal decoherence.

Abstract

We propose a scheme to generate robust stationary continuous-variable entanglement in optomechanical systems, based on geometrical nonlinearity that occurs for large mechanical displacements. Such nonlinearity is often used to correct the dynamics of the systems in the strong coupling regime. It appears that geometrical nonlinearity enhances the entanglement and shifts its maximum towards high detuning values. Using the experimental parameters, we find that such a scheme generates a very robust entanglement against thermal decoherence even at room temperature. Our results show that geometrical nonlinearity affects entanglement as the optomechanical quantum interface.