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Again, look at how you would measure the interference pattern. I think that one would throw one photon at a time. And for each photon, one would need to know both the slit size and the place where it lands. Effectively measuring both x and p.
No, quantum particles don’t follow definite trajectories.. this is the whole point of the path integral approach. It envisions space as infinitely many infinitesimally small slits stacked one after another.
You can’t say it left the slot with this or that momentum and followed some definite trajectory and work backwards
We can say this only of asymptotic non interacting states, which we do in the LHC
Thats exactly right. Position and trajectory are not the same thing. But coming back to the slit experiment. If the conjugate variables are slit size and pettern width. You have to gather information on both many times un order to see a Heisenberg like relationship.
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