correlation-exchange

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    Luisda_
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    In a classical system, particles have well-defined positions and motions, and correlation appears because they interact with each other. In a quantum system, there is an additional effect that comes from the quantum nature of identical particles. This effect is called exchange and it has no direct classical equivalent. Because of this, the quantum description needs to separate exchange from the rest of the correlation effects, so the same definition cannot be used in exactly the same way for classical and quantum systems.

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