Implications of Local Friendliness violation for quantum causality

• URL: http://arxiv.org/abs/2106.04065v2
• Date: Fri, 10 Dec 2021 01:46:43 GMT
• Title: Implications of Local Friendliness violation for quantum causality
• Authors: Eric G. Cavalcanti and Howard M. Wiseman
• Abstract summary: We provide a new formulation of the Local Friendliness no-go theorem of Bong et al [Nat. Phys. 16, 1199 ( 2020)] from fundamental causal principles. quantum causal models have been proposed as a way to maintain a peaceful coexistence between quantum mechanics and relativistic causality.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We provide a new formulation of the Local Friendliness no-go theorem of Bong et al [Nat. Phys. 16, 1199 (2020)] from fundamental causal principles, providing another perspective on how it puts strictly stronger bounds on quantum reality than Bell's theorem. In particular, quantum causal models have been proposed as a way to maintain a peaceful coexistence between quantum mechanics and relativistic causality, while respecting Leibniz's methodological principle. This works for Bell's theorem but does not work for the Local Friendliness no-go theorem, which considers an extended Wigner's Friend scenario. More radical conceptual renewal is required; we suggest that cleaving to Leibniz's principle requires extending relativity to events themselves.

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