Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 77: Quantum Networks: Platforms and Components II
FM 77.5: Talk
Thursday, September 26, 2019, 15:15–15:30, 1098
Ultra-compact and ultra-bright photon-pair source for QKD — •Emma Brambila1,2, Fabian Steinlechner1, and Markus Gräfe1 — 1Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Albert-Einstein-Straße 7, 07745 Jena, Germany. — 2Friedrich-Schiller University Jena, Abbe School of Photonics, Albert-Einstein-Str. 5, 07745 Jena, Germany.
Polarization entangled photon pairs are the major ingredient for various quantum technology applications, in particular for quantum key distribution (QKD). There, compact, stable, and very bright entangled photon pairs sources (EPS) are demanded for field deployment. Only by providing reliable EPS as user-friendly hardware components, QKD can be commercialized and applied for society outside research lab facilities.
In this work, we present a prototype lab-version of a compact, simplified, highly stable, and ultra-bright EPS. The polarization entangled photon pair source is based on a type-0 phase matched ppKTP crystal in a Sagnac-loop, which is pumped at 405 nm. The EPS is fully fiber coupled and designed as turn-key system. We are going to present data on its characterization like fidelity, spectral distribution of signal and idler photons, and the heralding efficiency.