Demonstration of the complementarity of one- and two-photon interference
نویسندگان
چکیده
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 oneand 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 oneand two-photon interference ~coherence and entanglement! in the spatial domain.
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