Time has no Impact on Quantum Mechanics.

Diagram for the double-slit experiment
Diagram for the double-slit experiment (Photo credit: Wikipedia)
In the double slit experiment, if you shine light through two slits, one photon at a time, it will shine in a wave like pattern, as light is a wave. But, if you place detectors so that you can tell which slit each photon goes through, it collapses the wave and causes the light to shine in a direct line through the two slits, since light is also a photon. BUT, if you save the information on which slit the photon goes through on a computer, then erase that information after the experiment is over with, the light will shine in a wave like pattern, since no information exists as to which slit the photon went through. This is a long video going into the real nitty gritty of how the experiment actually works, but it looks like there are some shorter ones that are more accessible that are also up on youtube: https://www.youtube.com/watch?v=H6HLjpj4Nt4
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