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Recent electron quantum optics experiments performed with on-demand singleelectron sources call for a mixed time/frequency approach to electronic quantumcoherence. Here, we present a Wigner function representation of first orderelectronic coherence and show that is provides a natural visualization of theexcitations emitted by recently demonstrated single electron sources. It alsogives a unified perspective on single particle and two particle interferometryexperiments. In particular, we introduce a non-classicality criterion forsingle electron coherence and discuss it in the context of Mach-Zenhderinterferometry. Finally, the electronic Hanbury Brown and Twiss and the Hong OuMandel experiments are interpreted in terms of overlaps of Wigner function thusconnecting them to signal processing.

Wigner function approach to single electron coherence in quantum Hall edge channels