What is the evidence for electrons interfering with each other, not just themselves? When electrons are passed one by one through a double slit experiment a diffraction pattern forms over time. As far as I can tell the same pattern forms if a beam of electrons is passed through the slits. If so, then the pattern formed by the beam can be entirely explained in terms of individual electrons interfering with themselves.
Is there evidence that electrons interfere with each other and if so from what experiment? As in, do they interfere with electrons other than themselves. I'm having trouble searching for this because I get back too many hits for the double slit experiment itself.
 A: This turns out to be a surprisingly difficult experiment to do. To be absolutely sure you are seeing interference between different electrons you need two independent electron sources, and getting the two sources mutually coherent is very hard. As far as I know this was first achieved in 2007 as reported in Interference between two independent electrons: observation of two particle Aharonov-Bohm interference by Neder et al.
A somewhat more accessible discussion of the paper is given here though I'm afraid it is still considerably more complicated than the double slit experiment.
A: What is the double slit experiment  one electron at a time? It shows that the $Ψ^*Ψ$ of the experiment "electron +doubles σlits, given width and distance" ($Ψ$ the wavefunction) has the interference pattern of a sinusoidal function. Each electron scatters off the slits' collective field, and the slits collective field comes from electrons at the surfaces. So the double slit single electron at a time, shows interference effects of a single electron with the field of many electrons.
BTW an electron just by itself is a point particle in the quantum field theory of particle physics. "Interference " will always need an interaction , and boundary conditions for the solution of the quantum mechanical equation that defines a "wave function"
