The Problem With Von Neumann's Proof

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The proof shows up in von Neumann's textbook, quantum mechanics textbook. But Bell independently rediscovers these problems and also discovers the problems in similar proofs that have been published since. He says this non-locality is a fundamental feature not just of hidden variables, but of any theory that's going to reproduce the results of quantum mechanics with the exception of theories that break something more fundamental.

There are many mysteries surrounding quantum mechanics. To me, the biggest mysteries are why physicists haven’t yet agreed on a complete understanding of the theory, and even more why they mostly seem content not to try. This puzzling attitude has historical roots that go back to the Bohr-Einstein debates. Adam Becker, in his book What Is Real?, looks at this history, and discusses how physicists have shied away from the foundations of quantum mechanics in the subsequent years. We discuss why this has been the case, and talk about some of the stubborn iconoclasts who insisted on thinking about it anyway.

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Adam Becker received his Ph.D. in physics from the University of Michigan. He is currently a science writer and a Visiting Scholar at the Center for Science, Technology, Medicine & Society at UC Berkeley. His book What Is Real? The Unfinished Quest for the Meaning of Quantum Physics comes out in paperback on Sept. 3, 2019.

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