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Quantum [Un]Speakables II: 50 Years of Bell's Theorem. Teil 35: Reinhard Werner: Steering, and Maybe Why Einstein Didn’t Go All the Way to Bell’s Argument


  Österreichische Zentralbibliothek für Physik


Quantum [Un]Speakables II: 50 Years of Bell's Theorem

Mitschnitt einer Veranstaltung am Sonntag, dem 22. Juni 2014 im Lise Meitner-Hörsaal der Fakultät für Physik der Universität Wien

Teil 35: Vortrag von Reinhard Werner: "Steering, and Maybe Why Einstein Didn’t Go All the Way to Bell’s Argument"

Reinhard Werner ist Professor am Institut für Theoretische Physik der Leibniz-Universität Hannover.

Abstract: An important issue for Einstein in his debate with the mainstream quantum physicists was to criticize the idea that quantum states and wave functions could be considered as properties of single systems. The EPR paper was written to make this point. It determines, by the rules of quantum mechanics, the conditional state distribution on one side of a correlation experiment, which is obtained by the choice of a measuring device on the other. These state distributions are inconsistent with the existence of a prior distribution of pure states, for which Schrödinger coined the term "steering". In this way of looking at correlation experiments it is natural to try to resolve the inconsistency by allowing a finer description than the one given by wave functions. In modern terminology this would be the search for local hidden variables, shown to be inconsistent with quantum predictions only after Einstein's death by Bell. A quantum state with the steering property is necessarily entangled, but need not violate any Bell inequality.


Kapitel Titel Position
1. Vorspann 00:00:00
2. Einstein's quantum agenda 00:00:08
3. The Einstein-Podolsky-Rosen-Paradoxon 00:16:00
4. EPR via steering 00:27:58
5. EPR correlations and EPW distributions 00:35:59

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