A novel method to investigate how the spatial correlation of the pump beam affects the purity of polarization entangled states

TL;DR

This paper introduces a new all-optical method using a spatial light modulator to control and study how the spatial correlation of the pump laser beam influences the purity of polarization-entangled states, providing quantitative insights.

Contribution

It presents an innovative, all-optical approach with a spatial light modulator to precisely control the spatial phase and analyze its effect on entangled state purity.

Findings

Quantitative relation between pump beam spatial correlation and entangled state purity

Demonstration of control over entangled state properties via spatial phase modulation

Unprecedented control on the spatial phase function of entangled states

Abstract

We present an innovative method to address the relation between the purity of type-I polarization entangled states and the spatial properties of the pump laser beam. Our all-optical apparatus is based on a spatial light modulator, and it offers unprecedented control on the spatial phase function of the entangled states. In this way, we demonstrate quantitatively the relation between the purity of the generated state and spatial correlation function of the pump beam.