Symposium »Concepts of Probability in the Sciences« Mitschnitt einer Veranstaltung des Erwin Schrödinger International Institute for Mathematics and Physics (ESI) am Dienstag, dem 30. Oktober 2018 im Boltzmann-Hörsaal des ESI Teil 9. Časlav Brukner: "Wigner’s friend as a rational agent" Kamera: Matthias Dellago Schnitt: Daniel Winkler Časlav Brukner ist Professor für Quanteninformationstheorie und Grundlagen der Quantenphysik an der Fakultät für Physik der Universität Wien. Abstract: In 1961 the physicist Eugene Wigner proposed the “Wigner's friend” thought experiment in which an observer, Wigner, observes another observer, Friend, who performs a quantum measurement on a physical system. I will give evidences that the probabilistic statements of Wigner and Wigner’s Friend cannot fit into a single (observer-independent) theoretical framework, and are to be understood as relational in the sense that their determinacy is relative to an observer. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Overview. Bell's Theorem 00:00:08 3. Wigner's friend 00:09:52 4. Deutsch's version of the experiment 00:17:24 5. The no-go theorem 00:25:03 6. Wigner’s friend as a rational agent 00:32:42

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