The DemoQuanDT consortium is thrilled to announce a new preprint on the deployment of a carrier-grade quantum key distribution (QKD) network. This work highlights a groundbreaking achievement: the creation of a quantum-secured link spanning 923 km between the German cities Berlin and Bonn. The project demonstrated not only the technical feasibility of integrating QKD into existing network infrastructures, but also the scalability and practical implementation of QKD in a real-world carrier environment.
This milestone would not have been possible without the dedicated contributions of the partners: Deutsche Telekom, Adva Network Security GmbH, Hochschule Darmstadt, KEEQuant, Rohde & Schwarz Cybersecurity and Technische Universität Darmstadt.
You can find the full preprint here: https://arxiv.org/pdf/2503.21186 , and more information on the project site: https://www.forschung-it-sicherheit-kommunikationssysteme.de/projekte/demoquandt
