4 ms·
I’m not sure of what is your context but that unitary interaction is just the first step (also called pre-measurement) in von Neumann’s model of measurement.
by kgwgk 5y ago
I’m not sure of what is your context but that unitary interaction is just the first step (also called pre-measurement) in von Neumann’s model of measurement.
- monktastic1 5y agoIndeed. The context here is: > As a non-physicist who only knows QM from popular science texts, I always thought that wave function collapse does not require any human intervention and that this can be shown. When pop sci treatments explain that any physical system interacting with the apparatus "measures" it, they are just talking about what you call "pre-measurement." This causes a lot of confusion for students.
- kgwgk 5y agoI agree, I think. The observed “collapse” is not completely explained by decoherence (and even less satisfactory by many worlds).