Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Quantum Optics and Photonics III

Q 53.5: Talk

Thursday, March 8, 2018, 11:30–11:45, K 0.016

Birefrigent phasematching in an unpoled KTP waveguide as a source of pure infrared single photons — Laura Padberg, Vahid Ansari, Matteo Santandrea, •Christof Eigner, John M. Donohue, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Integrated pure single photon sources are a key component for quantum optical applications like quantum computation or quantum key distribution. Waveguides sources with tailored spatial modes are necessary for efficient coupling to optical fibres and integration into quantum networks.
We show our in-house fabrication of unpoled rubidium exchanged waveguides in potassium titanyl phosphate (KTP) and the birefringent characterisation of the generated parametric down conversion (PDC) state in our source. We demonstrate that our source design offers the possibility for asymmetric group velocity matching in the near-infrared telecommunication regime [1], which is a favourable condition for pure single photon generation. This makes it a perfect candidate for fibre-based networks and quantum protocols.
[1] arxiv.org/abs/1711.09678