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Originally Posted by Kriminal99
Or just another question why is it believed there are no local hidden variables in QM?
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In 1965, Bell wrote a seminal paper. In it, he analyzed the Einstein Podolsky Rosen paradox (a paradox regarding entangled particles). In this paper, he demonstrated that if there is some hidden variable then certain inequalities arise regarding the correlations. (I believe that paper is titled "On the E-P-R Paradox" you are welcome to read it). I beleive Griffith's intro quantum text also deals with Bell in an appendix.
These inequalities disagree with quantum mechanics. Hence, either quantum mechanics is wrong, or local hidden variables are wrong. Quantum mechanics has been experimentally validated time and time again.
-Will
