QUANTUM COMPLEXITY. “The quantum-mechanical computation of one molecule of methane requires 10(42) grid points. Assuming that at each point we have to perform only 10 elementary operations, and that the computation is performed at the extremely low temperature T = 3 × 10(-3) K, we would still have to use all the energy produced on Earth during the last century.” R. P. Poplavskii (1975)[Pop75], as quoted by Manin
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