http://www.bottomlayer.com/bottom/basic_delayed_choice.htmInteresting link.
You are well aware of my crackpot thoughts about infinity/eternity, and you may well recall my suggesting that QM gives us a “window” into infinity.
Let’s take the crackpottery a step further, and "test it experimentally".
The cosmos is infinite, there is no change or time, nor is it possible to differentiate in terms of location. To say that everything
is here and now is probably as close as we can get with our terminology.
Our Universe, which is a shadow of the cosmos, is characterised by space, time and progression, otherwise it would not be possible for us to maintain intelligent existence.
In the reality of the cosmos our double slit experiment exists in a static state in which (what we perceive as) a photon, or other particle, exists timelessly in every part of the set-up (and everywhere else).
Because, in our Universe, the experiment is carried out in linear time we are unable to see the complete picture, so we interpret different aspects of the experiment as demonstrating different outcomes.
In the same way that multiverse theories maintain that conflicting outcomes are all realised in different universes; an infinite cosmos theory, if there were such a thing, might suggest that what we perceive as different outcomes are all realised, eternally and changelessly, in the cosmos. Classical physical experiments cannot display the underlying reality, but QM can, and does.