  Quantum Ghost Imaging (QGI) is an intriguing imaging protocol that exploits
photon-pair correlations stemming from spontaneous parametric down-conversion
(SPDC). QGI retrieves images from two-path joint measurements, where
single-path detection does not allow to reconstruct the target image. This
technique, has been so far limited in terms of acquisition speed either by
raster scanning, or by the slow electronics of intensified cameras. Here we
report on a fast QGI implementation exploiting a SPAD array detector for the
spatially resolving path, enabling the acquisition of a ghost image in under
one minute. Moreover, the employment of non-degenerate SPDC allows to
investigate samples at infrared wavelengths without the need for short-wave
infrared (SWIR) cameras, while the spatial detection can be still performed in
the visible region, where the more advanced silicon-based technology can be
exploited. Our findings advance the state-of-the-art of QGI schemes towards
practical applications.
