Entanglement between light and microwave via electro-optic effect

TL;DR

This paper proposes a theoretical method to generate and analyze quantum entanglement between light and microwave signals using the electro-optic effect, considering various physical parameters affecting entanglement.

Contribution

It introduces a full quantum model of electro-optic interaction for light-microwave entanglement and studies how system parameters influence entanglement characteristics.

Findings

Entanglement is sensitive to temperature, detuning, and coupling parameters.

Robust entanglement persists at temperatures around 20 K under certain conditions.

System parameters can be tuned to optimize entanglement strength.

Abstract

We theoretically proposed one of the approaches achieving the quantum entanglement between light and microwave by means of electro-optic effect. Based on the established full quantum model of electro-optic interaction, the entanglement characteristics between light and microwave are studied by using the logarithmic negativity as a measure of the steady-state equilibrium operating point of the system. The investigation shows that the entanglement between light and microwave is a complicated function of multiple physical parameters, the parameters such as ambient temperature, optical detuning, microwave detuning and coupling coefficient have an important influence on the entanglement. When the system operates at narrow pulse widths and/or low repetition frequencies, it has obvious entanglement about 20 K, which is robust to the thermal environment.