Berlin 2014 – scientific programme
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SYQR: Symposium Quantum Repeater
SYQR 4: Photon Sources for Quantum Networks
SYQR 4.1: Talk
Tuesday, March 18, 2014, 14:00–14:15, Kinosaal
High efficient generation of single mode narrow-band photon pairs — •Michael Förtsch1,2, Gerhard Schunk1,2, Josef U. Fürst1,2, Dmitry Strekalov1,2, Florian Sedlmeir1,2, Harald G. L. Schwefel1,2, Thomas Gerrits3, Martin J. Stevens3, Sae Woo Nam3, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max Planck Institut für die Physik des Lichts, Günther-Scharowsky-Str. 1, Bau 24, 91058, Erlangen, Deutschland — 2Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058, Erlangen, Deutschland — 3National Institute of Standards and Technology, 325 Broadway, Boulder, CO, 80305, USA
Over the past ten years the interest in resonator assisted spontaneous parametric down-conversion (RA-SPDC) has increased significantly since it offers the possibility to efficiently generate narrow-band heralded single photons, which are directly compatible with atomic transitions. One still remaining challenge with RA-SPDC based systems is the efficient photon generation in exactly one spatiotemporal mode, which up to now is often accompanied with additional lossy filtering. Here we experimentally demonstrate a narrow-band RA-SPDC source based on a crystalline whispering gallery mode resonator, which emits photons in exactly one mode. The unique phase-matching conditions make additional filter cavities unnecessary and results to the best of our knowledge in the highest reported single mode pair-production rate. In combination with the unique wavelength and bandwidth tuning possibilities, our setup is ready to serve as the heralded single photon source in a large variety of proposed quantum-repeater networks.