1980
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Dirk Aerts, « Why it is impossible in quantum mechanics to describe two or more separated entities », Bulletins de l'Académie Royale de Belgique, ID : 10.3406/barb.1980.58711
We prove that a theory that is different from a classical theory and has the property that orthogonal states of a physical system are compatible states (a property called orthomodularity in axiomatics) cannot describe two separated entities. Quantum mechanics has this property and as a consequence it is impossible to describe two separated entities in quantum mechanics. This is essentially due to the fact that quantum mechanics is too specific a theory. We indicate the direction for a generalization where the problem could be solved.