  Light is a major carrier of information about the world around us, from the
microcosmos to the macrocosmos. The present methods of detection are sensitive
both to robust features, such as intensity, or polarization, and to more subtle
effects, such as correlations. Here we show how wave front detection, which
allows for registering the direction of the incoming wave flux at a given
position, can be used to reconstruct the mutual coherence function when
combined with some techniques previously developed for quantum information
processing.
