Quantum [Un]Speakables II: 50 Years of Bell's Theorem Mitschnitt einer Veranstaltung am Samstag, dem 21. Juni 2014 im Lise Meitner-Hörsaal der Fakultät für Physik der Universität Wien Teil 24: Vortrag von Robert Spekkens: "On Causal Explanations of Quantum Correlations" Robert Spekkens ist Professor am Perimeter Institute for Theoretical Physics in Waterloo (Ontario, Canada). Abstract: Causal discovery algorithms take as their input facts about correlations among a set of observed variables, and they return as their output causal structures that can account for the correlations. It is shown that any causal explanation of certain quantum correlations - those that violate a Bell inequality - must contradict a core principle of these algorithms, namely, that an observed statistical independence between variables should not be explained by fine-tuning of the causal parameters. The fine-tuning criticism applies to all of the standard attempts at causal explanations of Bell inequality violations, such as superluminal causal influences, superdeterminism, and retrocausation. Nonetheless, by understanding the innovation of quantum theory to be an innovation to the theory of Bayesian inference, one can generalize the notion of a causal model and salvage a causal explanation of quantum correlations without fine-tuning. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Simpson's paradox 00:00:08 3. Reichenbach's principle 00:07:09 4. Strength of correlations 00:15:26 5. Contradiction with quantum theory and experiment 00:23:53

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