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Adjustment is just cutting interference terms from equation. Mathematically apparent wave function collapse is caused by quantum decoherence. Wave-function co
by nabla9 5y ago
Adjustment is just cutting interference terms from equation.
Mathematically apparent wave function collapse is caused by quantum decoherence.
Wave-function collapse as a priori process is just speculation. Finding that it actually happens would be new physics.
- wizzwizz4 5y agoIn which case, where does the Born rule come from?
- nabla9 5y agohttps://en.wikipedia.org/wiki/Gleason%27s_theorem https://en.wikipedia.org/wiki/Gleason%27s_theorem
- wizzwizz4 5y agoHuh. I can't believe I missed this. Thanks.
- nabla9 5y agoIn quantum computing the consequence of the theorem (as I understand it) is that once you have asked every yes/no question there is to ask about the state, the state has collapsed.
- wizzwizz4 5y agoI didn't think you needed the theorem for that; quantum entanglement behaves very similarly to information theory (specifically, information provenance).
- tsimionescu 5y agoAs far as I can tell, that is just explaining the numeric value of the Born rule, not the wave function collapse/update. I have not found any claims that Gleason's theorem (which I was unaware of, so thank you for pointing it out!) solves the measurement problem.
- kgwgk 5y agoQuantum decoherence may give you a diagonal density matrix but you still need to "collapse" that to a single outcome in some way or another.
- tsimionescu 5y agoHowever you put it, [to a classical observer] the wave function still "collapses" after a measurement. This is most famously seen by adding a detector inside one of the slits for the double-slit experiment: the original wave function is not consistent with the experiment, you have to update the wave function after the interaction (or lack of interaction) with the detector. Sure, in MWI the wave function of the universe never collapses, but something similar still happens for "parts" of the universal wave function.