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It will be fascinating to see the transition between the small, definitely-quantum realm, and the intermediate, quantum-effects-get-washed-out-by-X realm.

X = ? Size? Internal entropy?

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It probably has just as much to do with the speed of the "thing", as the size of the "thing".

If you could send a cluster of molecules at relative speeds (to c) through a double-slit setup, you might get the pattern.

The more fascinating question for me is can you demonstrate the double slit experiment on something small enough that you can detect the effect in two separate scales with the same object.

Do you mean like seeing the diffraction envelope of the two-slit experiment?

I mean build 1,000 tiny devices can preform the two-slit experiment.

Repeat the two-slit experiment using those devices as the projectiles.

Then see if the internal decoherence counts as external decoherence.

PS: I have no idea if this is possible, or what other QM equivalents of this might be.

That would be a cool experiment. I would wonder if, in measuring two superimposed patterns, the order of measuring is important. Does measuring the small pattern destroy the large and vice-versa?

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