Time-resolved two-photon interference of weak coherent pulses

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Abstract
The observation of the Hong–Ou–Mandel (HOM)-type two-photon interference (TPI) has played an important role in the development of photonic quantum technologies. The time-resolved coincidence-detection technique has been effectively used to identify and characterize the TPI phenomena of long-coherence optical fields. Here, we report on the experimental demonstration of the TPI of two phase-randomized weak coherent pulses with time-resolved coincidence detection. The mutual coherence time between the two weak coherent lights is determined by applying a frequency noise to one of the two interfering lights. We analyze the HOM-type TPI fringe visibility according to the ratio of the coherence time to the pulse duration.
Funding Information
  • National Research Foundation of Korea (2020M3E4A1080030)
  • National Research Foundation of Korea (2020R1I1A1A01072979)
  • Information Technology Research Center (IITP-2021-2020-0-01606)

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