International Conference on Quantum Physics of Nature (QuPoN 2015) Mitschnitt einer Veranstaltung der Fakultät für Physik am Montag, dem 18. Mai 2015 im Großen Festsaal der Universität Wien Teil 3. Wojciech Zurek: "Quantum theory of the classical: decoherence, quantum Darwinism, and objective reality" Schnitt: Daniel Winkler Abstract: I will describe recent insights into the transition from quantum to classical. I will start with a minimalist (decoherence-free) derivation of preferred states. Thus, pointer states that define events (e.g., measurement outcomes) arise without the need to appeal to Born's rule (pk=|Ψk|2). Probabilities and Born’s rule can be then deduced from the symmetries of entangled quantum states. With probabilities one can analyze information flows from the system to the environment in course of decoherence. They explain how robust classical reality emerges from the quantum substrate by accounting for the familiar symptoms of objective existence of pointer states of quantum systems through redundancy of their records in the environment. Wojciech Zurek ist Professor am Los Alamos National Laboratory in Los Alamos (New Mexico). INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Textbook quantum theory. Decoherence 00:00:12 3. Why are measurements limited to orthogonal states? 00:10:50 4. Quantum Darwinism 00:20:32 5. Decoherence and spreading of quantum correlations 00:25:50 6. Collisional decoherence 00:31:51

Quantenphysik, Klassischer Grenzfall, Dekohärenz

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