Single-electron quantum tomography in quantum Hall edge channels

Abstract

We propose a quantum tomography protocol to measure singleelectron coherence in quantum Hall edge channels, and therefore access for the first time the wavefunction of single-electron excitations propagating in ballistic quantum conductors. Its implementation would open the way to quantitative studies of single-electron decoherence and would provide a quantitative tool for analyzing single- to few-electron sources. We show how this protocol could be implemented using ultrahigh-sensitivity noise measurement schemes. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.