Single photon avalanche diode arrays can provide both the spatial and temporal information of each detected photon. We present here the characterization of entangled light with a sensor specifically designed for quantum imaging applications. The sensors is time-tagging each detection events at the pixel level with sub-nanosecond accuracy, within frames of 50 ns. The spatial correlations between any number of detections in a defined temporal window can thus be directly extracted from the data. We show the ability of the sensor to characterize space-momentum entangled photon pairs emitted by spontaneous parametric downconversion. Their entanglement is demonstrated by violating an EPR-type inequality.
@article{arxiv.2006.10791,
title = {Characterization of space-momentum entangled photon with a time resolving CMOS SPAD array},
author = {Bruno Eckmann and Bänz Bessire and Manuel Unternährer and Leonardo Gasparini and Matteo Perenzoni and André Stefanov},
journal= {arXiv preprint arXiv:2006.10791},
year = {2020}
}