Journal
ENTROPY
Volume 23, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/e23080925
Keywords
quantum foundations; quantum causality; causal models; quantum causal models; Wigner's friend paradox; experimental metaphysics
Categories
Funding
- Australian Research Council (ARC) [FT180100317]
- Foundational Questions Institute [FQXi-RFP-CPW-2019, FQXi-RFP-1807]
- Fetzer Franklin Fund, a donor advised fund of Silicon Valley Community Foundation
- Australian Research Council [FT180100317] Funding Source: Australian Research Council
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This research provides a new formulation of the Local Friendliness no-go theorem based on fundamental causal principles, showing how it imposes stricter constraints on quantum reality than Bell's theorem. Quantum causal models are proposed as a way to maintain a peaceful coexistence between quantum mechanics and relativistic causality.
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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