[onemoreact]

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.

[dhimes]

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?