As early as 1926, Einstein wrote to his friend Max Born, one of the founders of quantum mechanics: “Quantum mechanics is certainly imposing. But an inner voice tells me that it is not yet the real thing. The theory says a lot, but does not really bring us closer to the secret of the ‘old one.’ I, at any rate, am convinced that He is not playing dice.” The same Max Born had earlier written that “the starting point of his considerations was a ‘remark by Einstein on the relation between [a] wavefield and light quanta.’” Einstein therefore ended up in fundamental disagreement with an idea that he
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