Hidden variable theory

in quantum physics, the theorem that locally causal hidden-variable theories cannot reproduce correlations predicted by quantum mechanics

any theory of quantum mechanics where probabilistic outcomes are actually determined precisely by unobservable internal variables

interpretation of quantum mechanics

In quantum mechanics, superdeterminism is a loophole in Bell's theorem. By postulating that all systems being measured are correlated with the choices of which measurements to make on them, the assumptions of the theorem are no longer fulfilled. A hidden variables theory which is superdeterministic can thus fulfill Bell's notion of local causality and still violate the inequalities derived from Bell's theorem. This makes it possible to construct a local hidden-variable theory that reproduces the predictions of quantum mechanics, for which a few toy models have been proposed. In addition to bei

hidden-variable theory that is with local realism

theorem that any hidden-variable theory describing quantum mechanics must be contextual