Where Quantum Probability Comes From

Where Quantum Probability Comes From
AP Photo/Tim Ireland

In A Philosophical Essay on Probabilities, published in 1814, Pierre-Simon Laplace introduced a notorious hypothetical creature: a “vast intelligence” that knew the complete physical state of the present universe. For such an entity, dubbed “Laplace's demon” by subsequent commentators, there would be no mystery about what had happened in the past or what would happen at any time in the future.

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