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We demonstrate a way to prepare single photons with a temporal envelope thatresembles the time reversal of photons from the spontaneous decay process. Weuse the photon pairs generated from a time-ordered atomic cascade decay: thedetection of the first photon of the cascade is used as a herald for theground-state transition resonant second photon. We show how the interaction ofthe heralding photon with an asymmetric Fabry-Perot cavity reverses thetemporal shape of its twin photon from a decaying to a rising exponentialenvelope. This single photon is expected to be ideal for interacting with twolevel systems.

Reversing the temporal envelope of a heralded single photon using a cavity