> Il 13/10/2024 12:40 CEST Alan Grayson <[email protected]> ha scritto: > > > > > On Sunday, October 13, 2024 at 2:27:06 AM UTC-6 scerir wrote: > > > > > It means that a system in a superposition is in one of the states defining > > the superposition, but we don't know which one. Brent alleged it is > > "exactly wrong". I'd like an argument why that's the case, if it is. Does > > it follow from Bell experiments? TY, AG > > > > Can we say that the observable has a DEFINITE value between two > > measurements? > > > > Imagine a spin-1/2 particle described by the state > > psi = sqrt(1/2)[(s+)_z+(s-)_z] . > > > > If the x-component of spin is measured by passing the spin-1/2 particle > > through a Stern-Gerlach with its field oriented along the x-axis, the > > particle will ALWAYS emerge 'up'. > > > > In fact (s+)_z = sqrt(1/2)[(s+)_x +(s-)_x] > > > > and (s-)_z = sqrt(1/2)[(s+)_x -(s-)_x] > > > > (where _z, _x, are the z-component and the x-component of spin) > > > > so psi = sqrt(1/2)[(s+)_z +(s-)_z] = (s+)_x. > > > > Now let us imagine that the state psi = sqrt(1/2)[(s+)_z +(s-)_z] is not a > > pure state but a mixture. > > In this case we might also think that - before measurement - the particle > > has a DEFINITE value, > > of the z-projection of the spin, let us say say [(s+)_z] OR [(s-)_z]. > > > > But, in this case, measuring the x-component of the spin, we would find 50% > > 'up'and 50% 'down'. But the real outcome says 100% 'up'. > > > > Succinctly; what exactly do you think you've proven? How does it relate to > the question posed on this threat? TY, AG >
If ignorance interpretation means that a system in a superposition is in one of the states defining the superposition, that interpretation is wrong -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/1056218233.327151.1728890035751%40mail1.libero.it.
