  We demonstrate the quantum Talbot effect using pairs of single photons
produced by parametric down conversion. In contrast to the previous works, we
use a programmable spatial light modulator to behave as a diffraction grating.
Thus, the investigation of the Talbot diffraction patterns under the variation
of grating structure can be easily performed. The influence of spectral
bandwidth of the down-converted photons on the diffraction pattern is also
investigated. A theoretical model based on the wave nature of photons is
presented to explain the Talbot diffraction pattern under varying conditions.
The measured diffraction patterns are in good agreement with the theoretical
prediction. We are convinced that our study improves the understanding of the
quantum Talbot effect.
