Continuous-wave spatial quantum correlations of light induced by multiple scattering

TL;DR

This paper combines theoretical and experimental approaches to study how nonclassical light exhibits spatial quantum correlations when passing through multiple scattering media, with control via incident quantum states.

Contribution

It introduces a continuous mode quantum theory for spatial quantum correlations in multiple scattering and demonstrates control of these correlations using bright squeezed-light sources.

Findings

Quantum correlations can be controlled by the quantum state of incident light.

Theoretical predictions agree with experimental measurements.

Spatial quantum correlations are induced and measurable in multiple scattering media.

Abstract

We present theoretical and experimental results on spatial quantum correlations induced by multiple scattering of nonclassical light. A continuous mode quantum theory is derived that enables determining the spatial quantum correlation function from the fluctuations of the total transmittance and reflectance. Utilizing frequency-resolved quantum noise measurements, we observe that the strength of the spatial quantum correlation function can be controlled by changing the quantum state of an incident bright squeezed-light source. Our results are found to be in excellent agreement with the developed theory and form a basis for future research on, e.g., quantum interference of multiple quantum states in a multiple scattering medium.