If we shine light on an electron wave passing through a double slit then the interference pattern is destroyed. This is now understood as decoherence coming from interaction of the electrons with light.

What I do not understand is why decoherence doesn't occur from the material making up the barrier (in which we have the slits). I mean why do we need the light to cause decoherence and why in the absence of the same does the electron behave like an isolated system?

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    $\begingroup$ I think part of the answer is obvious. The slit is such that its internal degrees of freedom do not interact with the electron. My question is realistically, what material is the slit made of and what should it be made of if we would want it to decohere the electron? $\endgroup$ – Borun Chowdhury May 30 '17 at 8:43

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