  Temporal ghost diffraction (TGD) is observed by taking two-photon
cross-correlation in the configuration of reciprocal two-slit diffraction (2SD)
where interference fringes develop on the light source side as opposed to the
detector side. To this end, a narrow-band chaotic light source and a gated
detector are used in the frequency-time domain, which emulate a randomly
pointing incoherent light source and a stationary pinhole detector in the
momentum-space domain, respectively. Spectral fringes with visibility that
closely follows a sinc function of spectral bandwidth are clear evidence that
legitimate TGD fringes due to two-photon interference develop even with
classical light.
