Why does the which path information collapse the wave function?

[audioloop]

On the other hand...how we can say that - all the attributes (all the possible choices) exist until measurement is performed?

then the reality is omni-existent

 

[Simon Bridge]

then the reality is omni-existent

In so far as "omniexistent" means" exists everywhere" then this would be correct, yes: reality is everywhere. If that's not what you mean then you'll have to clarify this use of the term.

I actually liked The following question from Audioloop, in responce to Mark_M's it's meaningless to speak of any of those observable properties prior to measurement, showing up in the email notification, but it seems to have been deleted:

[If] then, position does not exist, and consecuently(sic) without position there is no displacement, how can exist a trajectory then ?

A single classical trajectory, indeed, has no fundamental existence... however, we see trajectories all the time, for instance: in bubble chambers. The answer is that the classical trajectory shown in such things exists on average as an emergent phenominon due to many small interactions. You'll notice that the bubble trajectory has a width ... i.e. an uncertainty in the particle's position over time? However, it's still meaningless to speak of the particle's position prior to measurement. The trajectory shown is the result of many successive measurements. That's how you see it.

So the next step in the inquiry is to place a 2-slit experiment in a bubble chamber (or appropriate analog) isn't it? Then you can follow the rough trajectories from source to screen. ;)

 

[audioloop]

In so far as "omniexistent" means" exists everywhere" then this would be correct, yes: is everywhere. If that's not what you then you'll have to clarify this use of the term.

I actually liked The following question from Audioloop, in responce to Mark_M's it's meaningless to speak of any of those observable properties prior to measurement, up in the email notification, but it seems to have been deleted:A single classical trajectory, indeed, has no fundamental existence... however, we see trajectories all the time, for instance: in . The answer is that the classical trajectory shown in such things exists on average as an emergent phenominon due to many small interactions. You'll notice that the bubble trajectory has a width ... i.e. an uncertainty in the particle's over time? However, it's still meaningless to speak of the particle's prior to measurement. The trajectory shown is the result of many successive measurements. That's how you see it.

So the next step in the inquiry is to place a 2-slit experiment in a bubble chamber (or appropriate analog) isn't it? Then you can follow the rough trajectories from source to screen. ;)

and have a direction, it don't go to anyplace, nor does it come from all places.

 

[Maui]

If you place just one detector behind one of the slits(A and B, say you place the detector behind A) and shoot one electron and the detector doesn't register anything, it means you 'collapsed' the wavefunction without interacting with the electron in any way(complementairy requires that the electron went through the other). The information of the which path collapsed the wavefunction without interaction.