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Abstract: Randomness is a fundamental feature in nature and a valuable resource forapplications ranging from cryptography and gambling to numerical simulation ofphysical and biological systems. Random numbers, however, are difficult tocharacterize mathematically, and their generation must rely on an unpredictablephysical process. Inaccuracies in the theoretical modelling of such processesor failures of the devices, possibly due to adversarial attacks, limit thereliability of random number generators in ways that are difficult to controland detect. Here, inspired by earlier work on nonlocality based and deviceindependent quantum information processing, we show that the nonlocalcorrelations of entangled quantum particles can be used to certify the presenceof genuine randomness. It is thereby possible to design of a new type ofcryptographically secure random number generator which does not require anyassumption on the internal working of the devices. This strong form ofrandomness generation is impossible classically and possible in quantum systemsonly if certified by a Bell inequality violation. We carry out aproof-of-concept demonstration of this proposal in a system of two entangledatoms separated by approximately 1 meter. The observed Bell inequalityviolation, featuring near-perfect detection efficiency, guarantees that 42 newrandom numbers are generated with 99% confidence. Our results lay thegroundwork for future device-independent quantum information experiments andfor addressing fundamental issues raised by the intrinsic randomness of quantumtheory.

Autor: S. Pironio, A. Acin, S. Massar, A. Boyer de la Giroday, D. N. Matsukevich, P. Maunz, S. Olmschenk, D. Hayes, L. Luo, T. A. Mannin

Fuente: https://arxiv.org/

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