Control of visibility in the interference of signal photons by delays imposed on the idler photons
X. Y. Zou, Timothy P. Grayson, Glívia Angélica Rodrigues Barbosa, L. Mandeļ · Physical Review A · 1993
Further interference experiments have been carried out with the two signal beams emitted from two coherently pumped parametric down-converters when the two idler beams are aligned. Because of the quantum entanglement between signal and idler photons produced in the down-conversion, it is found that the visibility of the interference of signal photons can be controlled by insertion of differential time delays between the idler photons.