Deployed trusted-node quantum key distribution over 300 km with a multi-core fiber access link
arXiv:2606.06107v1 Announce Type: cross Abstract: Quantum key distribution (QKD) is increasingly considered for deployment in realistic communication networks, where long distances, heterogeneous fiber infrastructure, and coexistence with classical traffic present substantial challenges. Here, we demonstrate trusted-node QKD between Link\"oping University and the Stockholm hub of the Swedish national quantum communication infrastructure over 270 km of deployed single-mode fiber, extended by a 33 km multi-core fiber (MCF) segment emulating a metropolitan access link, for a total distance of 303
Advances in quantum technology and fiber infrastructure are enabling the practical deployment of quantum key distribution (QKD) over increasingly challenging real-world distances and conditions.
Secure and unhackable communication infrastructure is a foundational requirement for national security, critical infrastructure, and digital sovereignty in an age of advanced cyber threats and quantum computing development.
The demonstrated deployment of trusted-node QKD over 300 km, incorporating multi-core fiber for metropolitan access, significantly validates the feasibility of integrating quantum secured communication into existing complex networks.
- · National security agencies
- · Critical infrastructure providers
- · Telecommunications companies
- · Quantum technology developers
- · Adversarial state actors with advanced hacking capabilities
- · Traditional encryption methods facing quantum threats
Increased confidence and investment in the development and deployment of national quantum communication infrastructures.
Acceleration of research and development into more robust and scalable QKD solutions, potentially leading to quantum internet initiatives.
Enhanced digital sovereignty for nations capable of deploying and maintaining such secure communication networks, reducing reliance on conventional, potentially vulnerable, cryptographic standards.
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