An experimental optical physicist who coauthored the 1987 Hong-Ou-Mandel effect experiment. The team varied the relative arrival time of a photon pair at a beam splitter and counted coincidences. A narrow interference feature revealed subpicosecond timing information, converting a time scale too short for direct electronic timing into a path-delay measurement.[ref]
Measurement of Subpicosecond Time Intervals between Two Photons by Interference by C. K. Hong and others. Abstract and experimental arrangement: down-converted pairs and relative-delay interference
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