  Spatial correlations between two photons are the key resource in realising
many quantum imaging schemes. Measurement of the bi-photon correlation map is
typically performed using single-point scanning detectors or single-photon
cameras based on CCD technology. However, both approaches are limited in speed
due to the slow scanning and the low frame-rate of CCD-based cameras, resulting
in data acquisition times on the order of many hours. Here we employ a high
frame rate, single photon avalanche diode (SPAD) camera, to measure the spatial
joint probability distribution of a bi-photon state produced by spontaneous
parametric down-conversion, with statistics taken over $10^7$ frames acquired
in just 140 seconds. We verified the presence of spatial entanglement between
our photon pairs through the violation of an Einstein-Podolsky-Rosen criterion,
with a confidence level of 227 sigmas. Our work demonstrates the potential of
SPAD cameras in the rapid characterisation of photon correlations, leading the
way towards quantum imaging in real-time.
