title: Hong-Ou-Mandel dip measurements of polarization-entangled photon pairs at 1550 nm.
abstract: We performed a quantum interference experiment using two polarization-entangled photon pairs at 1550 nm, created in periodically poled lithium niobate waveguides. Using four-fold coincidences, a Hong-Ou-Mandel dip at diagonal polarization was observed with a visibility of 74.5% before subtracting accidental coincidences. This experiment lays a foundation for demonstrating polarization-based entanglement swapping and for realizing a quantum relay.
authors.affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST),1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. yh.setsu@aist.go.jp
authors.forename: Yinghong
authors.initials: Y
authors.lastname: Xue
authors.forename: Akio
authors.initials: A
authors.lastname: Yoshizawa
authors.forename: Hidemi
authors.initials: H
authors.lastname: Tsuchida