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.
@article{arxiv.1706.03594,
title = {Two-photon interference of polarization-entangled photons in a Franson interferometer},
author = {Heonoh Kim and Sang Min Lee and Osung Kwon and Han Seb Moon},
journal= {arXiv preprint arXiv:1706.03594},
year = {2021}
}
Comments
13 pages, 4 figures, accepted for publication in Scientific Reports