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Time-varying induced coherence

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Abstract

A previously reported interference experiment, involving two parametric downconverters with their idlers aligned, is reanalyzed with a time-dependent modulator introduced between the two downconverters. This change modifies the analysis nontrivially. It is found that the visibility of the interference effect is completely determined by the state of the modulator at one moment on the light cone backward from the detected photon, even though no photon may be passing the modulator at that time. The implication for a delayed-choice experiment is discussed briefly.

© 1992 Optical Society of America

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