Is it possible to construct an intensity interferometer (i.e., a number-flux interferometer) to measure the coherence properties of a beam of electrons? What qualitative differences do you expect there to be from a photon-intensity interferometer? What do you expect Eq. (9.59) to become?

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SW (t)8W (t +T) W(t) = W(t) W(t +T) - W(t) W(t) - = |2y|| (t)|². (9.59)