Learn about Quantum Key Distribution (QKD) systems in this 22-minute conference talk that explores their role in achieving quantum-secure communication for the post-quantum era. Discover the fundamental differences between QKD and Post-Quantum Cryptography (PQC), examine the potential of hybrid systems, and gain insights from Bundesdruckerei GmbH's practical testing experience with QKD systems. Explore real-world performance metrics, integration challenges with existing infrastructure, system limitations, and critical considerations for implementing quantum-secure communication solutions, presented by Senior Product Architect Jan Klaußner from the German Federal Ministry of Finance-owned Bundesdruckerei GmbH.