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Sci Rep. 2017 Jul 18;7(1):5772. doi: 10.1038/s41598-017-06196-x.

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

Author information

1
Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.
2
Korea Research Institute of Standards and Science, Daejeon, 34113, South Korea.
3
National Security Research Institute, Daejeon, 34044, South Korea.
4
Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea. hsmoon@pusan.ac.kr.

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.

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