As I understand, decoherence consists of making the observation that when we trace out the environment from the overall density matrix of the system, we get von Neumann's projection postulate state with classical amplitudes. Furthermore, we know that we can always embed a local irreversible process in a global reversible one.

I want to add that I am not looking for more technical objections against decoherence theory, I just want to know why it has the FAPP tag against it, and what more is expected from it by physicists.



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