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QI: Fachverband Quanteninformation
QI 36: Poster – Quantum Information (joint session QI/Q)
QI 36.21: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Continuous-variable QKD with rate-adaptive error correction for the QuNet initiative — •Stefan Richter1,2, Hüseyin Vural1,2, Lukas Eisemann1,2, Jan Schreck1,2, Kevin Jaksch1,2, Ömer Bayraktar1,2, Thomas Dirmeier1,2, Wenjia Elser1,2, Dominique Elser1,2, and Christoph Marquardt1, 2 — 1Lehrstuhl für Optische Quantentechnologien, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany — 2Max-Planck-Institut für die Physik des Lichts, 91052 Erlangen, Germany
Continuous-variable quantum key distribution (CV-QKD) offers a way to establish symmetrically encrypted secure communication over untrusted channels and backed by security proofs not reliant on assumptions of mathematical complexity. Here, we present our progress on implementating a CV-QKD system designed for metropolitan fiber optical links, which was deployed as part of a large-scale technology demonstration in October 2024 for the QuNet initiative. Our approach is based on discrete modulations (DM) of coherent states and optical homodyne detection, with separate and free-drifting sender and receiver lasers. As such, it is similar and widely compatible with modern fiber optical communication techniques. We discuss some of the unique technical challenges associated with deploying our prototype in a larger network, as well as our proposed mitigations. Secret key rates attained with a complete post-processing stack based on fixed rate error correction are contrasted with the results of using a novel rate-adaptive implementation instead, highlighting the practical advantages of the latter.
Keywords: CV-QKD; QuNet; experimental; error correction