Protecting Distributed Blockchain with Twin-Field Quantum Key Distribution: A Quantum Resistant Approach
This work addresses the problem of securing distributed blockchains against quantum attacks for consortium networks, offering a novel integration of quantum key distribution with blockchain consensus mechanisms.
The paper tackles the challenge of quantum computing threats to classical blockchain systems by proposing a scalable quantum-resistant blockchain architecture that leverages twin-field quantum key distribution (TF-QKD) within a measurement-device-independent topology, resulting in optimized infrastructure complexity scaling from quadratic to linear and enabling large-scale, long-distance consortium deployment.
Quantum computing provides the feasible multi-layered security challenges to classical blockchain systems. Whereas, quantum-secured blockchains relied on quantum key distribution (QKD) to establish secure channels can address this potential threat. This paper presents a scalable quantum-resistant blockchain architecture designed to address the connectivity and distance limitations of the QKD integrated quantum networks. By leveraging the twin-field (TF) QKD protocol within a measurement-device-independent (MDI) topology, the proposed framework can optimize the infrastructure complexity from quadratic to linear scaling. This architecture effectively integrates information-theoretic security with distributed consensus mechanisms, allowing the system to overcome the fundamental rate-loss limits inherent in traditional point-to-point links. The proposed scheme offers a theoretically sound and feasible solution for deploying large-scale and long-distance consortium.