Short interference fringe and high event rate of two-photon interference using up-converted photon pairs

Atsushi Syouji, Ryosuke Shimizu, Shigehiro Nagano, Koji Suizu, Keiichi Edamatsu

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a hybrid approach to detecting a short fringe period of two-photon interference with high brightness, by combining spontaneous parametric down-conversion (SPDC) and up-conversion techniques. Photon pairs were generated at the wavelength of 1550 nm via SPDC, and converted to 516.7 nm through up-conversion process with the pump light 775 nm in efficiency ∼90%. The two-photon interference of the up-converted photon pairs exhibited a fringe period of 258.3 nm with high event rate (∼2000 counts s−1), which was 6 times shorter than the original wavelength, demonstrating that the energy-time correlation of the photon pairs was preserved. The technique simultaneously provides short fringe period beyond the classical limit and high brightness of the photon pairs.

Original languageEnglish
Article number022003
JournalJapanese Journal of Applied Physics
Volume62
Issue number2
DOIs
Publication statusPublished - 2023 Feb 1

Keywords

  • photon pairs
  • two-photon interference
  • up-conversion

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