International Conference on Quantum Physics of Nature (QuPoN 2015) Mitschnitt einer Veranstaltung der Fakultät für Physik am Freitag, dem 22. Mai 2015 im Großen Festsaal der Universität Wien Teil 44. Caslav Brukner: "Reconstructions of quantum theory - pros and contras" Schnitt: Daniel Winkler Abstract: In recent years, several reconstructions of quantum theory - derivations of the theory from a small set of axioms - have been proposed. A frequent response to these schemes is that such reconstructions are devoid of ontological commitments. The critics often argue that reconstructions deduce quantum theory “only” at the operational level, i.e. in terms of the primitive operations an observer conducts in a laboratory, and that nothing can be generally concluded from them about the status of the notion of physical reality. It seems to me that the critics frequently underestimate the success of the reconstructions. The point of such approaches is that the very idea of quantum states as representatives of information - information that is sufficient for computing probabilities of outcomes following specified preparations - has the power to explain why the theory has the very mathematical structure it does. This in itself contains an important message. Using the examples of the “subspace axiom” and the “purification axiom”, I will argue that reconstructions provide us with new insights into lasting debates about violations of Bell’s inequalities and the Wigner-friend thought experiment, respectively. Caslav Brukner ist Professor für Quanteninformationstheorie und Grundlagen der Quantenphysik an der Fakultät für Physik der Universität Wien. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. A letter from Anton Zeilinger 00:00:12 3. Quantum measurement problem 00:05:28 4. A measure of irreversibility 00:10:39 5. David Deutsch's thought experiment 00:14:11 6. Bell's experiment 00:20:55

Quantenphysik, Beobachtung, Experiment

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