# Imaging Spatial Quantum Correlations through a Scattering Medium

## TL;DR

This paper demonstrates imaging of spatial quantum correlations of entangled photon pairs transmitted through a scattering medium, revealing speckle patterns and showing the advantage over incoherent light, with a method that captures correlations instantaneously.

## Contribution

It introduces a novel method for imaging quantum correlations through scattering media using entangled photons, enabling instantaneous measurement of twin images.

## Key findings

- Entangled photon pairs exhibit speckle patterns after transmission.
- Incoherent light does not reveal information about the medium.
- The method captures quantum correlations instantaneously.

## Abstract

We image with cameras entangled photon light transmitted through a random medium. Near-field and far-field spatial quantum correlations show that entangled photon pairs (bi-photons) generated by spontaneous optical parametric down-conversion exhibit speckle pattern. In contrast, no information from the random medium can be extracted using incoherent light issued from one photon of the pair. Although these measurements require several hours to record thousands of image pairs, our method is instantaneous for the recording of one pair of twin images and involve all the photons of the images.