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John Stewart Bell in 1964 proved that broad classes of local hidden-variable theories cannot reproduce the correlations between measurement outcomes that quantu
by singularity2001 4y ago
John Stewart Bell in 1964 proved that broad classes of local hidden-variable theories cannot reproduce the correlations between measurement outcomes that quantum mechanics predicts. The most notable exception is superdeterminism. Superdeterministic hidden-variable theories can be local and yet be compatible with observations.
- IX-103 4y agoThere are quite a few exceptions that Bell's theorem doesn't cover. In addition to superdeterminism, it doesn't cover the case where the measurement equipment becomes entangled with the system being observed (in other ways than making a measurement). In addition, if the universe is not strictly quantized and the appearance of quantized measurements comes about through certain "preferred" resonant modes determined by the structure of the universe, we would see the measurements predicted by quantum mechanics despite having only purely local state (seemingly violating Bell's theorem, but since Bell's theorem assumes a quantum universe it doesn't actually apply)