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Wavefunction collapse amounts to the apparent reduction of a wavefunction consisting of a superposition of several eigenstates to a single eigenstate (by "observation"). It underlies measurement in quantum mechanics and connects the wave function with classical observables, in a thermodynamically irreversible interaction with a classical environment, normally disfavoring future QM interference.

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Does the wave function/density state actually exist?

I want you to think computationally. Obviously, nature can and does compute quantum mechanics. It remains to be asked how nature does it. The Copenhagenists will smugly tell you it does not matter ho …
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