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Researchers at the University of Edinburgh have developed a hybrid authentication protocol that eliminates reliance on pre-shared keys or post-quantum computational assumptions by leveraging physical unclonable functions and quantum local indistinguishability. This approach establishes a new foundation for securing entanglement-based quantum networks, offering enhanced robustness against both classical and quantum attacks without compromising practical implementation.
University of Edinburgh team builds secure quantum network protocols
Authentication is a fundamental building block of secure quantum networks, essential for quantum cryptographic protocols and often debated as a key limitation of quantum key distribution in security standards. Researchers at School of Informatics, University of Edinburgh, introduced a new authentication approach combining hardware assumptions and quantum properties to achieve provable security in entanglement-based protocols.
Researchers at the University of Edinburgh have developed quantum network authentication protocols that uniquely sidestep the need for either small pre-shared keys or reliance on post-quantum computational assumptions. Published on October 1, 2026, the work combines physical unclonable functions, a type of hardware security, with the quantum property of local indistinguishability in non-local states to achieve what the team terms in entanglement-based protocols. This hybrid approach, detailed in Quantum Science and Technology, establishes the first entanglement-based extension of hardware-based quantum authentication and offers a flexible solution for secure quantum communication networks. This approach enhances practicality and compatibility with current quantum communication infrastructure, addressing a limitation in standard quantum key distribution security. This hybrid design offers a distinct path toward securing future quantum networks. The team’s authentication protocols are not limited to a prepare-and-send network model, prompting investigation into whether an entanglement-based version could offer additional advantages from both foundational and practical perspectives. This question is particularly relevant for advanced quantum networks using distributed entanglement between nodes, potentially unlocking more…
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