Practical No-Signalling proof Randomness Amplification using Hardy paradoxes and its experimental implementation

Understand

Device-Independent (DI) security is the best form of quantum cryptography, providing information-theoretic security based on the very laws of nature.

• In its highest form, security is guaranteed against adversaries limited only by the no-superluminal signalling rule of relativity.
• The task of randomness amplification, to generate secure fully uniform bits starting from weakly random seeds, is of both cryptographic and foundational interest, being important for the generation of cryptographically secure random numbers as well as bringing deep connections to the existence of free-will.
• DI no-signalling proof protocols for this fundamental task have thus far relied on esoteric proofs of non-locality termed pseudo-telepathy games, complicated multi-party setups or high-dimensional quantum systems, and have remained out of reach of experimental implementation.