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As with any unsettled questions there are pros & cons to the various takes on quantum reality. Part of the appeal of MWI (intrication of observer into observed
by cb321 4y ago
As with any unsettled questions there are pros & cons to the various takes on quantum reality. Part of the appeal of MWI (intrication of observer into observed system as part of the measurement process) to me was always that the instantaneousness you mention here is a very "ordinary" kind of "fastness by synchronization". It's basically just a kind of causal wavefront hitting.
There are plenty of "infinitely fast" synchronization effects like this..some perhaps less obvious than others, but many pretty pedestrian and accessible to lay people. Neither the junction of a scissors or the "spot light" on clouds need be constrained by light speed, for example. People routinely abuse "nothing" (or maybe "go") in the " 'nothing' can 'go' faster than light" saying. :-)
- kgwgk 4y ago> intrication of observer into observed system as part of the measurement process That was already part of von Neumann’s model of measurement over 90 years ago.
- cb321 4y agoYeah. Perhaps most charmingly treated here: https://arxiv.org/abs/2011.12671 https://arxiv.org/abs/2011.12671 { EDIT: though surely many other places! There are also YouTube videos of this one, though, and Sidney Coleman was really a Feynman-class edutainer, perhaps as under-recognized as von Neumann is relative to say Everett on this topic :-) }. I should perhaps have used the word "entanglement" rather than "intrication". Oops.
- cb321 4y agoAlso of interest might be the treatment by Lev Landau in his Course on Theoretical Physics Volume 3: Quantum Mechanics - non-relativistic theory. Deriving the Born "postulate" is in Section7: "The wave function and measurements" in the most available 2nd edition (but it is admittedly a rather abbreviated derivation). I am not sure if that was in the original 1958 edition. Quantum systems measuring other quantum systems is part & parcel of quantum computation. So that can lead to more clear thinking on (some of) these matters.