Post-quantum steering is a stronger-than-quantum resource for information processing
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.
Cite
@article{arxiv.2102.06581,
title = {Post-quantum steering is a stronger-than-quantum resource for information processing},
author = {Paulo J. Cavalcanti and John H. Selby and Jamie Sikora and Thomas D. Galley and Ana Belén Sainz},
journal= {arXiv preprint arXiv:2102.06581},
year = {2022}
}
Comments
9 pages, loads of diagrams. Comments welcome. Latest version: published version