title: Photon coincidences in spontaneous parametric down-converted radiation excited by a blue LED in bulk LiIO3 crystal.
abstract: We report on experimental and numerical investigation of two-photon coincidence properties of the parametric spontaneous down-converted field excited by a high brightness blue LED in bulk lithium iodate crystal. Ratio of up to 11.5% of coincidence, which cannot be attributed to classical coincidences, to single photon counts was recorded at the outputs of multimode fibers, demonstrating well-preserved biphoton property. This result, combined with practically useful power of the source, suggests its possible application for a class of quantum experiments.
authors.affiliation: Department of Quantum Electronics, Vilnius University, Saulėtekio Av. 9, Bldg 3, LT10222 Vilnius, Lithuania.
authors.forename: Justinas
authors.initials: J
authors.lastname: Galinis
authors.forename: Michał
authors.initials: M
authors.lastname: Karpiński
authors.forename: Gintaras
authors.initials: G
authors.lastname: Tamošauskas
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Dobek
authors.forename: Algis
authors.initials: A
authors.lastname: Piskarskas