Scientific Reports (Jul 2017)

Two-photon interference of polarization-entangled photons in a Franson interferometer

  • Heonoh Kim,
  • Sang Min Lee,
  • Osung Kwon,
  • Han Seb Moon

DOI
https://doi.org/10.1038/s41598-017-06196-x
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 6

Abstract

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Abstract We present two-photon interference experiments with polarization-entangled photon pairs in a polarization-based Franson-type interferometer. Although the two photons do not meet at a common beamsplitter, a phase-insensitive Hong-Ou-Mandel type two-photon interference peak and dip fringes are observed, resulting from the two-photon interference effect between two indistinguishable two-photon probability amplitudes leading to a coincidence detection. A spatial quantum beating fringe is also measured for nondegenerate photon pairs in the same interferometer, although the two-photon states have no frequency entanglement. When unentangled polarization-correlated photons are used as an input state, the polarization entanglement is successfully recovered through the interferometer via delayed compensation.