Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.50: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
An improved DM-CV-QKD system for metropolitan fiber links — •Stefan Richter1,2, Hüseyin Vural1,2, 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) is a key building block for the quantum-safe encryption schemes needed to protect sensitive communications against the growing threat of many-qubit quantum computers in the coming decades. We present our prototype of a CV-QKD system for metropolitan fiber optical links based on the discrete modulation (DM) of coherent states and compare it to an earlier iteration. We propose solutions to several technical challenges of the implementation, including procedures for automatic working-point stabilization, calibration, as well as phase recovery and tracking. Asymptotic keyrate estimates as a performance metric are discussed in the context of additional constraints imposed by the error correction implemention.
Keywords: CV-QKD