Equation 89 · The Atlas That Refuses to Close
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the weak value of any observable. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.
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There is a fifth kind of answer to “where,” and it is worth stating precisely how it differs from all four above before using it. Prepare a system in a state | , couple it weakly to a pointer, and then postselect on a final state |f measured after the coupling. The weak value of any observable , position among them, conditioned on that postselection is
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