Measuring spatial coherence of quantum and classical light with an ultrastable monolithic interferometer
Quantum Physics
2025-07-03 v1 Optics
Abstract
We describe a monolithic interferometer for spatial coherence measurements of both classical and quantum light sources. The design combines parametric down-conversion with a thermal source, using two identical calcite crystals to control beam alignment via birefringence. The monolithic structure ensures inherent stability. Spatial coherence is measured through temporal interferograms and spectral analysis, with both methods showing close agreement with theoretical predictions. The system is robust and performs reliably for both quantum and classical light. Its design enables automated, rapid coherence measurements across different source types.
Keywords
Cite
@article{arxiv.2507.01512,
title = {Measuring spatial coherence of quantum and classical light with an ultrastable monolithic interferometer},
author = {Edoardo Suerra and Mirko Siano and Bruno Paroli and Samuele Altilia and Marco A. C. Potenza and Matteo G. A. Paris and Simone Cialdi},
journal= {arXiv preprint arXiv:2507.01512},
year = {2025}
}