Protecting Distributed Blockchain with Twin-Field Quantum Key Distribution: A Quantum Resistant Approach

2026-03-16

AI Summary

This work proposes a scalable, quantum-resistant blockchain architecture that integrates twin-field quantum key distribution (TF-QKD) into a measurement-device-independent (MDI) network topology, enabling a deep fusion of information-theoretic security and distributed consensus. Classical blockchain systems are vulnerable to quantum computing threats, while existing QKD schemes suffer from limited connectivity and transmission range. By leveraging the MDI framework with TF-QKD, the proposed design overcomes the rate-loss bottleneck inherent in point-to-point links, reducing infrastructure complexity from quadratic to linear scaling. This advancement significantly enhances both scalability and deployment distance, offering a theoretically rigorous and practically feasible solution for securing large-scale, long-distance consortium blockchains against quantum attacks.

Technology Category

• Machine Learning: Quantum Machine Learning
• Search and Optimization: Distributed Search
• Data Mining & Knowledge Management: Scalability, Parallel & Distributed Systems

Application Category

• Security and Privacy: Blockchains and distributed ledgers
• Economics, Online Markets and Human Computation: Economic aspects of blockchain and cryptocurrencies
• Systems and Infrastructure for Web, Mobile and WoT: Decentralized Web and Fediverse systems

Abstract

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.

Problem

• quantum computing
• blockchain security
• quantum key distribution
• distance limitation
• scalability

Innovation

• Twin-Field QKD
• quantum-resistant blockchain
• measurement-device-independent
• information-theoretic security
• scalable quantum network