Coherent feedback control of multipartite quantum entanglement for optical fields

TL;DR

This paper investigates how coherent feedback control can be used to manipulate and enhance multipartite optical entanglement generated by a non-degenerate optical parametric amplifier, providing theoretical insights for experimental implementation.

Contribution

It introduces a method to control and improve multipartite optical entanglement using coherent feedback, with specific conditions for enhancement and practical parameter considerations.

Findings

Control of quantum correlations via beam splitter transmissivity

Conditions for enhancing multipartite entanglement

Numerical results based on realistic system parameters

Abstract

Coherent feedback control (CFC) of multipartite optical entangled states produced by a non-degenerate optical parametric amplifier is theoretically studied. The features of the quantum correlations of amplitude and phase quadratures among more than two entangled optical modes can be controlled by tuning the transmissivity of the optical beam splitter in CFC loop. The physical conditions to enhance continuous variable multipartite entanglement of optical fields utilizing CFC loop are obtained. The numeric calculations based on feasible physical parameters of realistic systems provide direct references for the design of experimental devices.