2D-cross-double-slit experiments for understanding quantum world

  • #1
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The regular double-slit experiment is the "the basic Mystery" in quantum (Feynman).
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now I have done several cross-double-slit experiments with different configurations,
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My question is: how photons “sense”: (1) which slit they pass through; (2) what photons they will interferewith, then to create interference pattern accordingly. When the experiments are performed with single photon, it is much hard to interpret.

for more observation of experiments, please see:
Observations of Cross-Double-Slit Experiments by Hui Peng
International Journal of Physics. 2020, 8(2), 39-41. DOI: 10.12691/ijp-8-2-1
 

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  • #2
Nugatory
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There's a basic misunderstanding here.

Quantum mechanical interference is self-interference, the phenomenon that we observe when a single photon at a time is sent towards the slits and the various paths it might take interfere with one another to affect the probability of the photon being detected at various points on the screen. Each individual photon is detected at a single point on the screen (for example, makes a dot on a piece of photographic film) and the interference pattern only appears after many of these single-photon detections when more dots have appeared in some areas and fewer in others.

Using a laser to illuminate the slits does not demonstrate quantum mechanical interference. As with Young's experiment early in the 19th century, we're observing only the classical interference of electromagnetic waves.

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