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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster: Quantum Optics and Photonics II

Q 41.27: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

An FPGA based time-acquisition system for QKD — •Kai Roth, Stefan Schürl, Erik Fitzke, Oleg Nikiforov, and Thomas Walther — AG Laser und Quantenoptik, Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany

Quantum Key Distribution offers information-theoretical security for communication, superior to the majority of contemporary classical key distribution schemes. We are working on a robust system for quantum key distribution in a real-world commercial telecommunication network.

In order to evaluate detection times of photon pair incidents and to extract the key, we develop a low-cost FPGA-based two channel system for timing difference acquisition of TTL signals with a resolution below 500 ps. This resolution is achieved using programmable delay-lines in an FPGA. Afterwards, the detected events are processed by a Raspberry Pi computing the secure key.