Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 74: Quantum Information: Quantum Communication III

Q 74.5: Talk

Friday, March 27, 2015, 15:30–15:45, K/HS1

Interfacing various atomic transitions and telecom wavelengths with a single tunable narrowband photon-pair source — •Gerhard Schunk, Ulrich Vogl, Michael Förtsch, Dmitry Strekalov, Florian Sedlmeir, Harald G. L. Schwefel, Gerd Leuchs, and Christoph Marquardt — Max Planck Institute for the Science of Light, Institute for Optics, Information and Photonics, University Erlangen-Nuremberg, Erlangen, Germany

Today, sources of non-classical light do not offer the same performance as classical laser sources in terms of stability, compactness, efficiency, and wavelength tunability. We present a compact source of photon-pairs and squeezed light based on efficient parametric down conversion in a triply resonant whispering-gallery resonator (WGR) made out of lithium niobate. The central wavelength of the emitted light can be tuned over hundreds of nanometer and allows for precise and accurate spectroscopy with single signal and single idler photons of tunable bandwidth. Based on our analysis of the various eigenmodes of the WGR, we employ different wavelength tuning mechanisms, which we combine for continuous tuning. With this we demonstrate tuning to the D1 lines of rubidium (795 nm) and cesium (895 nm) and a scanning over the Doppler-broadened and Doppler-free absorption line of the Cs D1 F4'-F3 transition. The corresponding idler photons are emitted at 1312 nm for cesium and 1608 nm for rubidium. Providing this flexibility in connecting various alkali atoms with telecom wavelengths, this system opens up novel possibilities to realize proposed quantum repeater schemes.