Journal
PHYSICS LETTERS A
Volume 384, Issue 16, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2020.126323
Keywords
Bell inequalities; CHSH inequality; PR boxes; Quantum channels
Categories
Funding
- OPTIQUTE [APVV-18-0518]
- COST Action [CA15220]
- grant of the Slovak Research and Development Agency [APVV-16-0073]
- DFG
- ERC [683107/TempoQ]
- GACR [GA16-22211S, MUNI/G/1211/2017]
- [VEGA 2/0142/20]
- [VEGA 2/0173/17]
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It is shown that Popescu-Rohrlich nonlocal boxes (beating the Tsirelson bound for Bell inequality) do exist in the existing structures of both quantum and classical theory. In particular, we design an explicit example of measure-and-prepare nonlocal (but no-signaling) channel being the realization of nonlocal and no-signaling Popescu-Rohrlich box within the generalized probabilistic theory of processes. Further we present a post-selection-based spatially non-local implementation and show it does not require truly quantum resources, hence, improving the previously known results. Interpretation and potential (spatially non-local) simulation of this form of process nonlocality and the protocol is discussed. (C) 2020 Elsevier B.V. All rights reserved.
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