r/askscience Oct 07 '22

Physics What does "The Universe is not locally real" mean?

This year's Nobel prize in Physics was given for proving it. Can someone explain the whole concept in simple words?

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u/Baloroth Oct 07 '22

You don't really need quantum mechanics to explain this, the exact same thing happens if you use classical wave theory. You only need quantum mechanics if you perform this with single photons, at which point you're quantum anyways (since photons are a purely quantum phenomenon).

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