Michelle Mei Wang

Quantum random number generators (QRNGs) provide intrinsic unpredictability originating from fundamental quantum mechanics. Most demonstrations focus on creating a self-tested, device-independent generator to retain genuineness from imperfect implementations. However, these efforts benefit only individual users, not beacon users. The difference is, QRNG users have physical access to their own trustless devices while beacon users only receive numbers broadcasted from a centralized source of randomness. Thus, in applications where multiple participants need a common set of RNs,they are obligated to trust the honesty of QRNG manufacturers, or a third party, and security of the communication. In this paper, we introduce the first consensus protocol that produces QRNs ina decentralized environment (dQRNG) where all N users can contribute in the generation process and verify the randomness of numbers they collect. Security of the protocol is guaranteed given(N-1) dishonest participants. We realize our protocol by performing a proof-of-principle experiment with four players.