Abstract

A new theory for multimode parametric downconversion is given that yields differen, t predictions from existing treatments for photodetection tails. The theory is rigorous and is derived from first principles. The cases of both a single-atom and a nonlinear-crystal source are treated. The detection is taken to be far from the source. For a single atom the photodetection amplitude has a tail in the reduced time that falls off asymptotically as the inverse second power. The corresponding tail for the case of a crystal has an inverse quartic falloff.

© 1995 Optical Society of America

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