"When two systems, of which we know the states by their respective representatives, enter into temporary physical interaction due to known forces between them, and when after a time of mutual influence the systems separate again, then they can no longer be described in the same way as before, viz. by endowing each of them with a representative of its own. I would not call that one but rather the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of thought. By the interaction the two representatives (or ψ-functions) have become entangled."
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Erwin Schrödinger, "Discussion of Probability Relations Between Separated Systems" (Oct 28, 1935) Proceedings of the Cambridge Philosophical Society, Vol. 31, Issue 4, p. 555. Also see "Probability Relations Between Separated Systems" Vol. 32 (Oct 26, 1936): pp. 446–451.
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