Agree with weinzierl, you want to look into Bell's theorem. He essentially set a limit (Bell's inequality) to what local variables could do to influence the mea

Agree with weinzierl, you want to look into Bell's theorem. He essentially set a limit (Bell's inequality) to what local variables could do to influence the measurements on both entangled particles. Bell's inequality has repeatedly been violated in experiments on quantum mechanics, which tells us that local, hidden variable cannot be the cause for the correlations in measurements of entangled particles. Bell's theorem then simply states that local hidden variables cannot ever reproduce all the experiments of quantum mechanics. It's not strictly correct to say that Occam's Razor says we should have hidden variables. Occam's Razor is the idea that in deciding between two or more similar theories (which both have to be correct), we should prefer the simpler of the theories. Bell's theorem tells us that we should reject the notion of local hidden variables. Importantly, this does allow the notion of nonlocal hidden variables. One such theory is the de Broglie-Bohm theory, which claims that the wavefunction is an actual physical entity, referred to as the pilot wave or guiding wave. It would be nonlocal because the wavefunction collapse of one particle to measure its properties would necessarily influence the other particle at superluminal speeds. Another nonlocal hidden variable theory is superdeterminism, which claims that everything that ever happened and ever will happen has already been determined, so the correlations are not a result of some spooky interaction, they were just "predestined" to be correlated. This would again be nonlocal because the universe as a whole would have knowledge of the particle properties a priori.