Quantum vs. noncontextual semi-device-independent randomness certification

Understand

We compare the power of quantum and classical physics in terms of randomness certification from devices which are only partially characterised.

• We study randomness certification based on state discrimination and take noncontextuality as the notion of classicality.
• A contextual advantage was recently shown to exist for state discrimination.
• Here, we develop quantum and noncontextual semi-device independent protocols for random-number generation based on maximum-confidence discrimination, which generalises unambiguous and minimum-error state discrimination.