Gerardus `t Hooft
The Borderline between Classical and Quantum Mechanics
According to John Bell's famous theorem, classical systems cannot reproduce certain quantum phenomena such as superpositions and entanglement. Therefore quantum models and classical models are usually considered to be entirely different, with a gap in between. Yet there are numerous examples where a simple direct mapping exists that maps the solutions of Schr"odinger equations onto the solutions of classical equations. The most conspicuous example of a model with such a "duality" is superstring theory.
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