Quantum Byzantine agreement in blockchain:protocol,application and outlook
Blockchain technology ensures data security,integrity,and traceability through decentralization and distributed databases,with core components including distributed ledgers,encryption technology,and consensus mechanisms.The Byzantine agreement protocol,as a key component,is crucial for maintaining the security and consistency of decentralized networks.However,the rapid development of quantum computing threatens the security of classical Byzantine agreement protocols and their inability to surpass the 1/3 fault tolerance bound,making the study of quantum Byzantine agreement protocols necessary.This paper discusses the challenges faced by classical Byzantine agreement protocols in the quantum computing era and introduces the development and practical challenges of detectable quantum Byzantine agreement.It focuses on the recently proposed new quantum Byzantine consensus protocol based on quantum digital signatures,which breaks the 1/3 fault-tolerance bound,offers information-theoretic security,and is experimentally feasible.Finally,it discusses the constraints of the blockchain trilemma on Byzantine agreement and looks forward to the development of quantum Byzantine agreement protocols and their prospects for decentralized communication and computation in quantum networks.
quantum Byzantine agreementquantum digital signaturesquantum multiparty correlation1/3 fault-tolerance boundquantum blockchain
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