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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantum Communication I

Q 7.4: Vortrag

Montag, 11. März 2024, 11:45–12:00, HS 3219

Discrete-modulated continuous-variable QKD over an atmospheric channel — •Kevin Jaksch^1,2, Thomas Dirmeier^1,2, Jan Schreck^1,2, Yannick Weiser^1,2, Stefan Richter^1,2, Ömer Bayraktar^1,2, Bastian Hacker^1,2, Conrad Rößler^1,2, Imran Khan^1,2, Andrej Krzic³, Markus Rothe³, Markus Leipe³, Nico Döll³, Christopher Spieß³, Matthias Goy³, Florian Kanitschar^4,5, Stefan Petscharning⁴, Thomas Grafenauer⁴, Bernhard Ömer⁴, Christoph Pacher⁴, Twesh Upadhyaya⁵, Jie Lin⁵, Norbert Lütkenhaus⁵, Gerd Leuchs^1,2, and Christoph Marquardt^2,1 — ¹Max Planck Institute for the Science of Light, Erlangen, Germany — ²Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — ³Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany — ⁴AIT Austrian Institute of Technology, Center for Digital Safety&Security, Vienna, Austria — ⁵Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Canada

In future metropolitan QKD networks, atmospheric links can provide secure communication complementary to the fiber backbone. For this, we implemented a discrete-modulated continuous-variable QKD system over an urban 1.7 km atmospheric channel in Jena. After sub-binning the transmission to cope with the fluctuating nature of the channel, we study the applicability of a recently published security proof in the finite size regime [1] and a fixed set of implemented error correction codes for secret key generation.

[1] Kanitschar et al., PRX Quantum 4, 040306 (2023)