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Dec 15, 2017 at 0:19 comment added user4552 Decoherence turns pure states into mixed states Not true. Unitary evolution can never do such a thing, and unitary evolution is all that's going on in decoherence. The information about phase correlations still exists, it's just in the environment now. It does not cover the projection itself that turns the mixed states into individual (pure) eigenstates. Here you seem to be assuming a nonunitary process such as Copenhagen-style collapse, but there is no reason to assume such a thing.
Dec 14, 2017 at 23:10 history edited lurscher CC BY-SA 3.0
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Dec 14, 2017 at 22:38 history answered lurscher CC BY-SA 3.0