An inequality-free form of this statement concerns only perfectly correlated states and was developed by Greenberger, Horne, and Zeilinger.
One generalization of this statement bounds a sum of the correlations between a, b, a', and b' between two and negative two. An inequality-free form of this statement concerns only perfectly correlated states and was developed by Greenberger, Horne, and Zeilinger. Doubt was cast on the former generalization, named for Clauser, Horne, Shimony, and Holt, by the experiments of Alain Aspect, while the latter generalization of this statement, which attempts to explain wavefunction collapse when non-commuting variables are measured, is intended to explicitly distinguish entanglement and the possibility of hidden variables. For 10 points, name this statement, which suggests that no local hidden variables theory can reproduce all the results of quantum mechanics.
One generalization of this statement bounds a sum of the correlations between a, b, a', and b' between two and negative two.
{Bell's theorem}