Nanjing University proposes an unconditionally secure quantum Byzantine consensus protocol with 1/2 fault tolerance limit

PANews reported on January 8 that the research team of Professor Chen Zengbing and Associate Professor Yin Hualei from the School of Physics of Nanjing University, the State Key Laboratory of Solid State Microstructure Physics, and the Collaborative Innovation Center for Artificial Microstructure Science and Technology proposed an unconditionally secure quantum Byzantine with a 1/2 fault tolerance limit. consensus protocol. By constructing a multi-round broadcast basic unit based on quantum digital signatures and introducing a loop recursion structure, the research team proved a safe path based on the binary tree model. While achieving information theory-provable security, it broke through 1/2 of the classic Byzantine consensus protocol. 3 fault tolerance limit. On this basis, the team successfully demonstrated for the first time a five-node quantum blockchain consensus network containing two malicious nodes, and demonstrated the implementation of distributed billing, an important application of blockchain in the financial field.