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A caveat, though, in quantum field theory, we sometimes have nonpositive states and in that case, a probabilistic interpretation makes no sense. At any rate, even in ordinary quantum field theory, we need to work with quantum probability instead of classical probability.
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This is a stub article. Ideally, it will make clear that the correlation functions in astronomy, financial market analysis, etc., are all instances of the same idea; therefore, a disambiguation page is not what this should be.