Controlling electronic decoherence in quantum Hall edge channels

The recent developments of electron quantum optics in quantum Hall edge channels has opened the way to the development of quantum devices based on traveling single electron excitations. In particular, the development of single electron quantum tomography protocols based on two particle interferences has given us a new way to probe non linear electron quantum optics effects such as the ones induced by Coulomb interactions on single to few electron excitations propagating in ballistic quantum channels. In this talk, we discuss electronic decoherence through electron/hole pair creations in a single quantum Hall edge channel and show that a careful sample design can lead to decoherence control in the quantum Hall edge channel system at filling fraction two. We also discuss how such a specifically engineered interacting region could be used for single plasmon or single photon emission triggered by a single electron source.