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For a small molecule like caffeine, the number of possible electron interactions explodes exponentially. To simulate it exactly on a classical computer would require memory bits exceeding the number of atoms in the observable universe. Classical chemists use approximations (like Density Functional Theory) to bypass this, but these approximations fail when chemistry gets "messy"—such as in high-temperature superconductors or complex enzymatic reactions in the human body. (if it exists as a free or open-access

The difficulty arises from the electron. Electrons do not behave like billiard balls; they behave like waves and particles simultaneously. They are "correlated." When one electron moves, it instantaneously influences the probabilities of every other electron in the system. They are "correlated