title: Preservation of photon indistinguishability after transmission through surface-plasmon-polariton waveguide.
abstract: We experimentally demonstrated preservation of indistinguishability between two photons via mode conversions, namely, photon-to-plasmon and plasmon-to-photon conversions. A two-photon interference experiment was carried out using a broadband photon pair generated through a spontaneous parametric downconversion process. We observed the so-called Hong-Ou-Mandel dip with an interferometer including a 1-mm-long surface-plasmon-polariton (SPP) waveguide. The photon indistinguishability of 92.4% was retained after propagation in the SPP waveguide.
authors.affiliation: Institute of Quantum Science, Nihon University, Tokyo, Japan. go-fujii@aist.go.jp
authors.forename: Go
authors.initials: G
authors.lastname: Fujii
authors.forename: Toshiya
authors.initials: T
authors.lastname: Segawa
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Mori
authors.forename: Naoto
authors.initials: N
authors.lastname: Namekata
authors.forename: Daiji
authors.initials: D
authors.lastname: Fukuda
authors.forename: Shuichiro
authors.initials: S
authors.lastname: Inoue