Bell's Theorem: The Quantum Venn Diagram Paradox

This video is about Bell's Theorem, one of the most fascinating results in 20th century physics. Even though Albert Einstein (together with collaborators in the EPR Paradox paper) wanted to show that quantum mechanics must be incomplete because it was nonlocal (he didn't like "spooky action at a distance"), John Bell managed to prove that any local real hidden variable theory would have to satisfy certain simple statistical properties that quantum mechanical experiments (and the theory that describes them) violate. Since then,  Daniel M. Greenberger, Michael A. Horne, Anton Zeilinger and others have managed to extend the theoretical work, and Alain Aspect performed the first Bell test experiment in the late 1980s.

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