Angular-resolved photon-coincidence measurements in a multiple-scattering medium

TL;DR

This paper reports on angular-resolved photon-coincidence measurements in a three-dimensional disordered medium, revealing strong correlations between scattered photons and providing insights into quantum phenomena like interference and entanglement.

Contribution

It introduces an experimental technique for measuring angular photon correlations in multiple scattering media, aligning with quantum theory predictions and enabling studies of quantum effects.

Findings

Strong photon correlations between different angular directions

Determined the coherence time of the light source

Results agree with quantum theory of multiple scattering

Abstract

We present angular-resolved correlation measurements between photons after propagation through a three-dimensional disordered medium. The multiple scattering process induces photon correlations that are directly measured for light sources with different photon statistics. We find that multiple scattered photons between different angular directions with angles much larger than the average speckle width are strongly correlated. The time dependence of the angular photon correlation function is investigated and the coherence time of the light source is determined. Our results are found to be in excellent agreement with the continuous mode quantum theory of multiple scattering of light. The presented experimental technique is essential in order to study quantum phenomena in multiple scattering random media such as quantum interference and quantum entanglement of photons.