Implications of Local Friendliness Violation for Quantum Causality |
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Authors: | Eric G Cavalcanti Howard M Wiseman |
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Institution: | 1.Centre for Quantum Dynamics, Griffith University, Gold Coast, QLD 4222, Australia;2.Centre for Quantum Dynamics, Griffith University, Brisbane, QLD 4111, Australia; |
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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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Keywords: | quantum foundations quantum causality causal models quantum causal models Wigner’ s friend paradox experimental metaphysics |
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