Journal
NPJ QUANTUM INFORMATION
Volume 8, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41534-022-00574-8
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Funding
- Perimeter Institute for Theoretical Physics
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- Province of Ontario through the Ministry of Research, Innovation and Science
- Foundation for Polish Science (IRAP project, ICTQT - EU within Smart Growth Operational Programme) [2018/MAB/5]
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This article presents the application of post-quantum steering in information processing and demonstrates its significance and potential applications through the construction of a new probabilistic theory.
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.
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