Abstract

The wave–particle duality of a photon in emission is demonstrated by measuring the interference between spontaneous emissions in nearly opposite directions from a thin layer of organic dye. The interference is the product of a single photon from a single-emission process. It is shown that the Heisenberg uncertainty relation requires that the interference generated by the spontaneously emitted photon and the recoil transferred to the molecule by the emission cannot be observed simultaneously.

© 1992 Optical Society of America

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