  Optical mixing experiments show the ability of amplifying a weak optical
signal by superposing it with a stronger one. This principle has been
demonstrated also for weak signals at the quantum level, down to a single
photon. In the present communication it is suggested that the sensitivity of
optical mixing between a strong macroscopic source and a single photon can be
further enhanced as to allow the sensing the wavefront of the photon's mode
simultaneously at two or more locations. Key conditions for that detection is
reducing the active size of the detectors below the typical size of the
transverse modes, and performing an optical intensity correlation measurement
of the Hanbury Brown and Twiss type. Due to the inherent amplification effect
of the mixing process, a macroscopic signal is extracted, out of which the
photon wave-front characterization at more than one location is achievable with
good fidelity even for a single photon emission event. A basic scheme is
proposed for the demonstration of the effect, which is analyzed based on a
simple quantum model. The validity of the model is confirmed by comparison with
previous theoretical and experimental reports involving single photon sources.
