The only rational approach to this is to hypothesise that the photon is able to be in several places at once.
I would be inclined to go further and say that because the photon travelling at "c", it is everywhere within the set-up at the same time, in its own F of R.
With regard to the double slit experiment, we should remember that the major problem involves sending single photons through the setup, and finding that, provided there is no observation made of the passage of each photon, an interference pattern results which, with time, builds up into a pattern that is indistinguishable from that produced by continuous waves of light passing through the same slits. There can be no doubt that something interferes with the single photons as they pass through the slits, but what could it be? The idea that this something could be a “probability wave” leaves the more down-to-earth among us wondering what a probability wave might be, and if, in fact, it is anything more than a semantic convenience. However, its established place in scientific thought demands that it be considered.
Various candidates have been suggested as agents of interference, including:
1. Probability waves.
2. Pilot waves.
3. Photons from other universes.
If any of these is correct, the question still remains as to how observation disrupts the mechanism. How does observation collapse the probability waves, disrupt the pilot waves or exclude the interference from a vast number of other universes?
The simplest answer would seem to be that the time lapse involved in the experiment occurs only in the F of R of the observer. In its own F of R the photon is at every point in the set-up at the same time.
In the photon’s F of R:
1. There are no probability waves, the outcome is always a certainty.
2. The act of observing disturbs the photon and its pilot wave, but because this is part of the infinite existence of the photon, its appearance as part of a sequence of events occurs only in the observer’s F of R.
3. Photons from other universes will also be travelling at “c”, so they too will be at every point in the set-up at the same time, so the above reasoning will apply to them as well.
