Witworld: A generalised probabilistic theory featuring post-quantum steering

12 Feb 2021  ·  Paulo J. Cavalcanti, John H. Selby, Jamie Sikora, Thomas D. Galley, Ana Belén Sainz ·

We introduce Witworld: a generalised probabilistic theory with strong post-quantum features, which subsumes Boxworld. Witworld is the first theory that features post-quantum steering, and also the first that outperforms quantum theory at the task of remote state preparation... We further show post-quantum steering to be the source of this advantage, and hence present the first instance where post-quantum steering is a stronger-than-quantum resource for information processing. read more

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Quantum Physics