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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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What constitutes an observation/measurement in QM?

Nothing exists until it is measured and observed. the Copenhagen consensus Everything in this universe universally obeys the Schrodinger equation. There's no special measurement objective col …
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