npj Quantum Information (Jun 2022)

Post-quantum steering is a stronger-than-quantum resource for information processing

  • Paulo J. Cavalcanti,
  • John H. Selby,
  • Jamie Sikora,
  • Thomas D. Galley,
  • Ana Belén Sainz

DOI
https://doi.org/10.1038/s41534-022-00574-8
Journal volume & issue
Vol. 8, no. 1
pp. 1 – 10

Abstract

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Abstract We present the first instance where post-quantum steering is a stronger-than-quantum resource for information processing – remote state preparation. In addition, we show that the phenomenon of post-quantum steering is not just a mere mathematical curiosity allowed by the no-signalling principle, but it may arise within compositional theories beyond quantum theory, hence making its study fundamentally relevant. We show these results by formulating a new compositional general probabilistic theory – which we call Witworld – with strong post-quantum features, which proves to be a intuitive and useful tool for exploring steering and its applications beyond the quantum realm.