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Line 10: == Motivation == Macroscopic physics requires classical mechanics which allows accurate predictions of mechanical motion with reproducible, high precision. Quantum phenomena ~~requires~~require quantum mechanics, which allows accurate predictions of statistical averages only. If quantum states had hidden-variables awaiting ingenious new measurement technologies, then the latter (statistical results) might be convertible to a form of the former (classical-mechanical motion).<ref>{{Cite journal \|last=Bell \|first=John S. \|date=1966-07-01 \|title=On the Problem of Hidden Variables in Quantum Mechanics \|url=https://link.aps.org/doi/10.1103/RevModPhys.38.447 \|journal=Reviews of Modern Physics \|language=en \|volume=38 \|issue=3 \|pages=447–452 \|doi=10.1103/RevModPhys.38.447 \|issn=0034-6861}}</ref> Such a classical mechanics would eliminate unsettling characteristics of quantum theory like the [[uncertainty principle]]. More fundamentally however, a successful model of quantum phenomena with hidden variables implies quantum entities with intrinsic values independent of measurements. Existing quantum mechanics asserts that state properties can only be known after a measurement. As [[N. David Mermin]] puts it:

Hidden-variable theory: Difference between revisions