We demonstrate coincidence measurements of spatially entangled photons by means of a novel type of multi-pixel based detection array. The adopted sensor is a fully digital 8×16 silicon photomultiplier array allowing not only photon counting but also per-pixel time stamping of the arrived photons with a resolution of 65 ps. Together with a frame rate of 500 kfps, this property exceeds the capabilities of conventional charge-coupled device cameras which have become of growing interest for the detection of transversely correlated photon pairs. The sensor is used to measure a second-order correlation function for various non-collinear configurations of entangled photons generated by spontaneous parametric down-conversion. The experimental results are compared to theory.
@article{arxiv.1609.03419,
title = {Coincidence detection of spatially correlated photon pairs with a monolithic time-resolving detector array},
author = {Manuel Unternährer and Bänz Bessire and Leonardo Gasparini and David Stoppa and André Stefanov},
journal= {arXiv preprint arXiv:1609.03419},
year = {2016}
}