3 ms·
> 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
by 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.