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Jonathan Scott said:Regardless of the mechanism, there is a "magic" result in QM that the observation of one of the two entangled particles effectively puts the other one into a pure state as given by that result. Although the initial state of the pair of particles can be described by probabilities, once an observation has been made, the state at the other end is known exactly, and the other particle behaves like one prepared with a precisely known state.
If the pure state (spin, polarization, etc.) of the other particle is known exactly and if this state isn’t included in the QM wave function the QM is incomplete. So we came back to EPR argument that, as I understand, wasn’t yet challenged directly. The best known indirect challenge is the Bell’s theorem that is based on the formal logic, algebra, and violates relativism.