Megahertz-Rate Semi-Device-Independent Quantum Random Number Generators Based on Unambiguous State Discrimination

Jonatan Bohr Brask, Anthony Martin, William Esposito, Raphael Houlmann, Joseph Bowles, Hugo Zbinden, and Nicolas Brunner

Phys. Rev. Applied 7, 054018 (2017)

Our recent paper in Physical Review Applied demonstrates a new quantum random number generator which is simple to implement and achieves high bit rates, yet requires almost no trust in the devices used, leading to strongly improved security.

Generating certifiably random bit sequences using quantum devices is a fundamental challenge for cryptography, particularly as applied to secure communication. The device-independent approach offers the best security, but is impractical. This study presents a quantum random-number generator (QRNG) that is simple and achieves high bit rates, yet requires only mild assumptions (almost no trust) regarding the setup. This protocol offers a promising solution for the next generation of QRNGs, combining ease of implementation, commercially viable rates, and strong security.

In the Press: Nicolas Brunner talks about these recent results on RTS (Radio Télévision Suisse) - en français.