title: Narrowband photon pair source for quantum networks.
abstract: We demonstrate a compact photon pair source based on a periodically poled lithium niobate nonlinear crystal in a short cavity. This approach provides efficient, low-loss, mode selection that is compatible with standard telecommunication networks. Photons with a coherence time of 8.6 ns (116 MHz) are produced and their purity is demonstrated. A source brightness of 134 pairs (s. mW. MHz)(-1) is reported. The cavity parameters are chosen such that the photon pair modes emitted can be matched to telecom ultra dense wavelength division multiplexing (U-DWDM) channel spacings. The high level of purity and compatibility with standard telecom networks is of great importance for complex quantum communication networks.
authors.forename: F
authors.initials: F
authors.lastname: Monteiro
authors.forename: A
authors.initials: A
authors.lastname: Martin
authors.forename: B
authors.initials: B
authors.lastname: Sanguinetti
authors.forename: H
authors.initials: H
authors.lastname: Zbinden
authors.forename: R T
authors.initials: RT
authors.lastname: Thew