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This question can be answered without reference to human interaction, see the reference below for the experimental demonstration using photons. The general rule for double slit interference is: There …

There is an exact answer to your question: you do NOT need to know the which-slit information for the type of collapse you describe to occur. It is enough that the mere possibility of obtaining that …

If this hypothesis was true, we should see that quanta would be deposited on the detector at the same average rate they were removed from the source, but there would be no correlation between the pre …

...how much info could be known about how the particle interferes with itself crossing the double slits? A useful version of this setup is to consider one in which individual photons are passing thr …

What a person knows or doesn’t know is not a factor in the appearance or not of interference. The rule is: if it is possible in principle to derive the which path information from the setup, there wil …

It is an experimental fact that obtaining "which-path" information for a photon (for example) has nothing to do with being "disturbed". Yes, most experiments block off one of the two slits. And for …

[Arrgh, fell into trap of answering a 2 year old question. Well, the bot bumped it so I will leave my answer.] I would like to know, how can we be sure this is not due to the influence/interaction/i …

Surprisingly: there is no requirement that there be a which-path detector anywhere to eliminate (or not) interference in the Double Slit Experiment (DSE) with light (photons). And it can be done with …

How does the presence of the slot wall electrons or atoms affect the experiment? Answer: it makes no significant difference on the important outcome, which is: is there an interference pattern, or n …

There are experiments already that demonstrate that the observer is not necessary in the double slit equation. As to macroscopic versus microscopic: As the particles get bigger, the which path informa …

No humans required! The apparatus setup can be varied to yield either an interference pattern or not without ever learning which slit the photons go through. It is enough that it is possible to learn …

I agree that the Double Slit (DS) with photons is conceptually similar to the DS with an electron (or other quantum particle types). However, there are experimental & theoretical variations on the DS …

It may come as a surprise, but even single particles can evidence entanglement. Below is reference and abstract of an experimental realization. The point is that every particle is always in a superpo …

The rule is straightforward. If it is possible, even in principle, to learn information about which slit was traversed: interference will disappear accordingly. It has nothing directly to do with “dis …

Interestingly: When two particles - say photons - are entangled, neither will produce double slit interference at all. (For them to produce a double slit pattern, they must not be entangled and must …