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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.
Zou et al. (Mon,) studied this question.
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