Quantum blockchain using weighted hypergraph states

Abstract

Using the multiparty entanglement of quantum weighted hypergraph states, we built a protocol to build a quantum blockchain. In this protocol, the information contained by the classical blocks is initialized at a single qubit that acts as a vertex of the corresponding hypergraph and the entanglement of the hypergraph state serves the purpose of the "chain."The security and effectiveness of the protocol are then outlined. We further provide a quantum circuit and implement it on IBM's five-qubit computer with single- A nd two-qubit quantum gates as components.