Related papers: A refined Frauchiger--Renner paradox based on strong contextuality

A refined Frauchiger--Renner paradox based on strong contextuality

URL: http://arxiv.org/abs/2409.05491v1
Date: Mon, 9 Sep 2024 10:36:47 GMT
Title: A refined Frauchiger--Renner paradox based on strong contextuality
Authors: Laurens Walleghem, Rui Soares Barbosa, Matthew Pusey, Stefan Weigert,
Abstract summary: We observe that logical contextuality is the key ingredient of the FR paradox. We propose a natural extension of Peres's dictum to resolve these extended Wigner's friend paradoxes.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The Frauchiger--Renner paradox derives an inconsistency when quantum theory is used to describe the use of itself, by means of a scenario where agents model other agents quantumly and reason about each other's knowledge. We observe that logical contextuality (\`a la Hardy) is the key ingredient of the FR paradox, and we provide a stronger paradox based on the strongly contextual GHZ--Mermin scenario. In contrast to the FR paradox, this GHZ--FR paradox neither requires post-selection nor any reasoning by observers who are modelled quantumly. If one accepts the universality of quantum theory including superobservers, we propose a natural extension of Peres's dictum to resolve these extended Wigner's friend paradoxes.

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