Surviving Entanglement in Optic-Microwave Conversion by Electro-Optomechanical System

TL;DR

This paper investigates how entanglement between optical and microwave modes can be preserved during frequency conversion using electro-optomechanical systems, providing insights for quantum communication and sensing.

Contribution

It introduces a theoretical analysis of entanglement survival in optic-microwave conversion, identifying bounds and conditions for maintaining quantum correlations.

Findings

Surviving entanglement depends on system parameters.

An upper bound exists for entanglement after conversion.

The study offers a theoretical basis for quantum illumination applications.

Abstract

In recent development of quantum technologies, a frequency conversion of quantum signals has been studied widely. We investigate the optic-microwave entanglement that is generated by applying an electro-optomechanical frequency conversion scheme to one mode in an optical two-mode squeezed vacuum state. We quantify entanglement of the converted two-mode Gaussian state, where surviving entanglement of the state is analyzed with respect to the parameters of the electro-optomechanical system. Furthermore, we show that there exists an upper bound for the entanglement that survives after the conversion of highly entangled optical states. Our study provides a theoretical platform for a practical quantum illumination system.