CoQuS II Kick-Off Workshop, also honouring Reinhold Bertlmann's 65th Birthday Mitschnitt einer Veranstaltung von Universität Wien, Technischer Universität Wien und Fonds zur Förderung der wissenschaftlichen Forschung am Freitag, dem 1. Oktober 2010 im Christian-Doppler-Hörsaal der Fakultät für Physik der Universität Wien Teil 21. Anton Zeilinger (Universität Wien): Experiments and the Foundations of Quantum Mechanics Experiments in quantum information science, having emerged from experiments testing the foundations of quantum physics, are giving rise to a renewed debate about just these foundations. Most notably entanglement, dismissed as "spooky" by Einstein while called "the characteristic trait of quantum mechanics" by Schrödinger and as signified by John Bell and explained so nicely in his article on Bertlmann's socks, emerged as a central fundamental concept. It is also an important, in cases even crucial, notion for procedures like quantum cryptography, quantum computation, and quantum teleportation. Today entangled states can cover large distances, for example between two Canary Islands, and employ a significant number of particles and many different kinds of degrees of freedom, internal and external. The resulting development of experimental tools opened up possibilities for new experiments shedding more light on fundamental questions. The emerging picture is that the notions of reality or objectivity have to be scrutnized more deeply and information itself plays a fundamental role in the understanding the foundations of quantum mechanics. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Overview 00:00:25 3. Can quantum mechanics be considered complete? 00:05:50 4. Experiments on Bell's theorem 00:10:40 5. Testing freedom of choice 00:17:32 6. Wheeler's delayed-choice gedankenexperiment 00:26:27 7. Quantum eraser 00:30:18 8. What remains to be done? 00:35:21 9. Finding new combinations of the fundamental ideas 00:44:00

Quantenphysik, Verschränkter Zustand

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