Observation of spatial quantum correlations induced by multiple scattering of non-classical light

TL;DR

This paper experimentally demonstrates spatial quantum correlations induced by multiple scattering of non-classical light, revealing infinite-range correlations that depend on the quantum state and photon number, aligning with theoretical models.

Contribution

It provides the first experimental observation of spatial quantum correlations caused by multiple scattering of non-classical light, confirming theoretical predictions.

Findings

Spatial quantum correlations are induced by multiple scattering.

Correlations can be positive or negative depending on the quantum state.

Correlation magnitude depends on the number of photons.

Abstract

We present the experimental realization of spatial quantum correlations of photons that are induced by multiple scattering of squeezed light. The quantum correlation relates photons propagating along two different light trajectories through the random medium and is infinite in range. Both positive and negative spatial quantum correlations are observed when varying the quantum state incident to the multiple scattering medium, and the magnitude of the correlations is controlled by the number of photons. The experimental results are in excellent agreement with recent theoretical proposals by implementing the full quantum model of multiple scattering.