position of photon's detection evident upon photon emission?

[Frog march]

when a photon is emitted, from say a laser, then it can be said to be a wave, which means that it has a range of possibilities of being detected, as a photon, let's say along a line going from left to right 1 light year in front of it.

If the photon is detected at say 30degrees to the left of the laser then will that impart an angular impulse on the laser in the clockwise direction, and vice versa?

and as the laser will most likely be in a box in a years time or whatever, won't that angular impulse be experienced when that photon is emitted?

If so, then where that photon eventually ends up, could theoretically be known 1 year in advance of it hitting anything, wouldn't it?

[korjik]

when a photon is emitted, from say a laser, then it can be said to be a wave, which means that it has a range of possibilities of being detected, as a photon, let's say along a line going from left to right 1 light year in front of it.

If the photon is detected at say 30degrees to the left of the laser then will that impart an angular impulse on the laser in the clockwise direction, and vice versa?

and as the laser will most likely be in a box in a years time or whatever, won't that angular impulse be experienced when that photon is emitted?

If so, then where that photon eventually ends up, could theoretically be known 1 year in advance of it hitting anything, wouldn't it?

Chances are you know the dispersion of the beam in the first place, so you can figure out the probable location of any photon at any time.

Using your specific example tho, if you are measuring the angular momentum at the level where you can detect the impulse from each photon, then you are measuring the photon and at that point know its course. Down to the limits of uncertainty, of course.

[Cougar]

...If the photon is detected at say 30degrees to the left of the laser...

Won't such detection stop it in its tracks?