Demonstration of the complementarity of one- and two-photon interference
Ayman F. Abouraddy, Magued B. Nasr, Bahaa E. A. Saleh +2 more
The visibilities of second-order (one-photon) and fourth-order (two-photon) interference have been observed in a Young's double-slit experiment using light generated by spontaneous parametric down-conversion and a photon-counting intensified charge-coupled device camera. Coherence and entanglement underlie one- and two-photon interference, respectively. As the effective source size is increased, coherence is diminished while entanglement is enhanced, so that the visibility of one-photon interference decreases while that of two-photon interference increases. This experiment demonstrates the complementarity between one- and two-photon interference (coherence and entanglement) in the spatial domain.
arXiv:quant-ph/0112065•Physical Review A•May 8, 2001•86 citations