# Entangling cavity modes in a double-cavity optomechanical system

## TL;DR

This paper investigates how entanglement between cavity modes can be generated and controlled in a double-cavity optomechanical system with strong coupling, highlighting the advantages over mechanical mode entanglement.

## Contribution

It demonstrates that cavity mode entanglement can be significantly enhanced and manipulated through photon hopping and coupling ratios in a double-cavity optomechanical setup.

## Key findings

- Cavity mode entanglement exceeds mechanical mode entanglement by at least a factor of two.
- Entanglement is influenced differently by coupling strength ratios for cavity and mechanical modes.
- Strong-coupling regime enables effective entanglement generation between cavity modes.

## Abstract

We study entanglement of the cavity modes in a double-cavity optomechanical system in strong-coupling regime. The system consists of two optomechanical systems coupled by a single photon hopping between them. With the radiation pressure of the photon, entanglement of the cavity modes can be generated. The concurrence between the cavity modes is at least twice larger than that between the mechanical modes. Moreover, when we change the ratio between coupling strength and resonant frequency of mechanical modes, the entanglement in cavity and mechanical modes are influenced differently.