Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.1: Poster
Wednesday, March 11, 2026, 18:00–21:00, P4
An Efficient Error Correction Protocol Variant for Field Tests of Continuous-Variable Quantum Key Distribution — Lukas Eisemann1,2, •Stefan Richter1,2, Hüseyin Vural1,2, Ömer Bayraktar1,2, Kevin Jaksch1,2, and Christoph Marquardt1,2 — 1Chair of Optical Quantum Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7 / A3, Erlangen — 2Max Planck Institute for the Science of Light, Staudtstr. 2, Erlangen
Continuous-variable quantum key distribution (CV-QKD) requires near-optimally efficient information reconciliation (IR) to achieve high secret key rates (SKR) and transmission distances. Here, we present a novel and improved variant of a recently introduced IR-protocol, which is based on multiple decoding attempts (MDA). We evaluate our method on simulated data sets and employ it in the IR step for our fiber-based discrete-modulated CV-QKD system, which we deployed during a large-scale public technology demonstration in Berlin. In each instance, we observe meaningful key rate improvements over both the ubiquitous single decoding attempt protocol and the original MDA implementation, even at a fixed decoding complexity. We also discuss some of the practical challenges associated with CV-QKD deployments in real networks outside of a lab context, arguing that the adaptability of our method makes it well-suited to solve them, providing implementation benefits in the process.
Keywords: CV-QKD; quantum communication; continuous-variable QKD; error correction; information reconciliation