Field Demonstration of Trusted-Node QKD over Deployed Single-Mode and Multi-Core Fiber Infrastructure - Quantum Computing Report

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Field Demonstration of Trusted-Node QKD over Deployed Single-Mode and Multi-Core Fiber Infrastructure

A collaborative research team representing Linköping University, KTH Royal Institute of Technology, Stockholm University, and Chalmers University of Technology has reported the physical deployment of a long-haul, trusted-node Quantum Key Distribution (QKD) link integrated into a dynamically reconfigurable telecommunications network. Detailed in an open-access preprint on arXiv, the field trial established secure quantum channels over a total distance of 303 km in southeastern Sweden. The network topology connects a university lab in Linköping with a national quantum hub in Stockholm through an intermediate trusted node, combining standard long-haul single-mode fiber (SMF) with a multi-core fiber (MCF) access segment to emulate heterogeneous enterprise infrastructures.