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In this general brief overview, we discuss the different types of nodes and associated levels of security that can be considered in a quantum key distribution (QKD) network. This classification lead to different possible scenarios for QKD repeater chains and, more generally, for QKD network architectures.
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Stefano Pirandola, "Architectures for QKD networks," Proc. SPIE 12243, Photonics for Quantum 2022, 1224309 (19 July 2022); https://doi.org/10.1117/12.2635711