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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 Marquardt1,21Max 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.

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