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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Information II

Q 60.11: Poster

Thursday, March 17, 2022, 16:30–18:30, P

A compact and versatile DM-CV QKD system for the QuNET initiative — •Stefan Richter^{1, 2}, Ömer Bayraktar^{1, 2}, Kevin Jaksch^{1, 2}, Bastian Hacker^{1, 2}, Imran Khan^{1, 2, 5}, Emanuel Eichhammer^{1, 5}, Emmeran Sollner^{1, 5}, Twesh Upadhyaya³, Jie Lin³, Norbert Lütkenhaus³, Florian Kanitschar⁴, Stefan Petscharnig⁴, Thomas Grafenauer⁴, Ömer Bernhard⁴, Christoph Pacher⁴, Gerd Leuchs¹, and Christoph Marquardt¹ — ¹QIV Research Group, MPI for the Science of Light, Erlangen, Germany — ²Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany — ³Institute for Quantum Computing, Dept. of Physics and Astronomy, University of Waterloo, Canada — ⁴Security & Communication Technologies Unit, Austrian Institute of Technology, Vienna, Austria — ⁵now with KEEQuant GmbH, Fürth, Germany

Continuous-variable quantum key distribution (CV-QKD) is poised to become a key technology for securing critical communication infrastructure against the emerging threats of quantum computers. We present our implementation of a compact and versatile fiber-coupled discrete modulation CV-QKD system for metropolitan networks. We also show preliminary key rate estimates and channel characterization results obtained during a public technology demonstration in August 2021. Some aspects and challenges of the implementation are discussed, including error correction requirements.