Cavalcanti, Paulo J.Selby, John H.Sikora, JamieGalley, Thomas D.Sainz, Ana Belen2022-11-042022-11-042022-06-3076http://hdl.handle.net/10919/112382We 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.application/pdfenCreative Commons Attribution 4.0 InternationalnonlocalityArticle - Refereedhttps://doi.org/10.1038/s41534-022-00574-8812056-6387