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I think you'd normally characterize an entangled (pure) bipartitioned state by looking at its reduced density matrix in diagonal form. It ought to have more than one non-zero element along the diagonal.


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It might be clearer if you read it as "detect THE single particle passing through the slits" . If you use a strong light then there are lots of photons passing through the slits and the interference could be completely classical with different photons going through each slit and interfering at the screen - just like water waves. This was the picture for ...


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An LED is a collection of discrete atoms. When a current flows, an electron excites one every so often. The excited atom decays after a while and emits a photon. Assuming the current is uniform, variations in intensity come from randomness in arrival times and excited state lifetimes. Some time slices have many photons, some fewer. This distribution is ...


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Try S. L. McCall and E. L.Hahn -- Phys. Rev. vol. 183, p.457 (1969).


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As far as i could find with quick search EIT was first proposed by Jakob Khanin and graduate student Olga Kocharovskaya at Gorky State University, Russia, in 1986.



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