Lab Lunch: 29 June 2021 - Petros Wallden

Title: Quantum Magic Rectangles for Certified Randomness

Abstract: One of the most counter-intuitive properties of quantum theory is that it allows “non-local” correlations. This property can be used to achieve things that are impossible classically, such as “device-independent” cryptography (i.e. achieving a cryptographic task without any trust on the details of the device used). Non-locality can equivalently be described with wining probabilities at games with multiple, non-communicating, parties that exceed what is classically possible. In this talk after introducing these concepts, we define a new class of non-local games, the “magic rectangle games”, characterise the optimal quantum winning probabilities and apply the results to achieve certified, information-theoretic randomness expansion.

Based on: “Quantum Magic Rectangles: Characterization and Application to Certified Randomness Expansion” S. Adamson, P. Wallden, Phys. Rev. Research 2, 043317 (2020)