title: A versatile source of single photons for quantum information processing.
abstract: The generation of high-quality single-photon states with controllable narrow spectral bandwidths and central frequencies is key to facilitate efficient coupling of any atomic system to non-classical light fields. Such an interaction is essential in numerous experiments for fundamental science and applications in quantum communication and information processing, as well as in quantum metrology. Here we implement a fully tunable, narrow-band and efficient single-photon source based on a whispering gallery mode resonator. Our disk-shaped, monolithic and intrinsically stable resonator is made of lithium niobate and supports a cavity-assisted spontaneous parametric down-conversion process. The generated photon pairs are emitted into two highly tunable resonator modes. We verify wavelength tuning over 100 nm of both modes with controllable bandwidth between 7.2 and 13 MHz. Heralding of single photons yields anti-bunching with g(2)(0)<0.2.
authors: Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, Bau 24, Erlangen 91058, Germany.
authors: Michael
authors: M
authors: Förtsch
authors: Josef U
authors: JU
authors: Fürst
authors: Christoffer
authors: C
authors: Wittmann
authors: Dmitry
authors: D
authors: Strekalov
authors: Andrea
authors: A
authors: Aiello
authors: Maria V
authors: MV
authors: Chekhova
authors: Christine
authors: C
authors: Silberhorn
authors: Gerd
authors: G
authors: Leuchs
authors: Christoph
authors: C
authors: Marquardt
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