I don't think you can conclude that the particle did not a have a spin
state before measurement. We certainly know that when it does have a
spin state that we know, the SG result still depends on the SG
orientation. So it is not true that "the spin is determined by the
measuring device"; it is determined by *both* the particle spin state
and the apparatus.
Also note that I used the phrase "spin *state*" not spin "axis" or
"orientation". That's because the spin state can include superpositions
of different axes with different phases. States that are superpositions
of the measurable eigenstates are still real states even though we don't
have an instrument that detects them, e.g. a circularly polarized
electron wave.
Brent
On 11/24/2024 7:40 PM, Alan Grayson wrote:
Since spin is determined by the axis of an SG apparatus, and different
axis orientations give difference spin orientations, is this
sufficient to deny Realism since the spin is determined by the
measuring device, and has no preexisting orientation? TY, AG --
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