As explained in the answer to a question In the double slit experiment, using only one photon, will it create a diffraction pattern on an ultra sensitive screen?
During its path from the light source through the slits to the screen the light is delocalised, that is the photon doesn't have a position in the sense that macroscopic objects have a position. That's why it is able to pass through both slits at the same time.
Such an explanation couldn't explain fringes from single photons (over time) behind single edges. What is the explanation for the phenomenon that single photons produce fringes even behind single edges?
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