We report on a device capable of imaging second-order spatio-temporal correlations g (2) ( x , τ) between photons. The imager is based on a monolithic array of single-photon avalanche diodes (SPADs) 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 −1 at room temperature. An important application might be the local imaging of g (2) as a means of confirming the presence of true Bose–Einstein macroscopic coherence (BEC) of cavity exciton polaritons.
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Boïko et al. (2009) studied this question.
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