We report on a novel device capable of imaging second-order spatio-temporal correlations g2(x,t) between photons. The imager is based on a monolithic array of single-photon avalanche diodes (SPAD) implemented in CMOS technology and a simple algorithm to treat multiphoton time-of-arrival distributions from different SPAD pairs. It is capable of 80 ps temporal resolution with fluxes as low as 10 photons/s at room temperature. An important application might be the local imaging of g2 as a means of confirming the presence of true Bose-Einstein macroscopic coherence (BEC) of cavity exciton polaritons.
@article{arxiv.0807.3025,
title = {A Quantum Imager for Intensity Correlated Photons},
author = {D. L. Boiko and N. J. Gunther and N. Brauer and M. Sergio and C. Niclass and G. B. Beretta and E. Charbon},
journal= {arXiv preprint arXiv:0807.3025},
year = {2009}
}
Comments
8 pages, 4 figures, references added. Accepted in NJP