Vendredi 04 avril 2014 à 09h00
Salle 234, Ecole de Physique

Wigner function representation in electron quantum optics

Dario Ferraro, Université d'Aix-Marseille

A time-frequency description of the electron coherence will be presented in analogy with the Wigner function representation in quantum mechanics. This approach reveals extremely useful in order to encode in a unique real function both the coherence properties in the time domain and the nature of the excitation generated by single or few electron sources on integer quantum Hall edge channels. Single and two electrons interferometers will be described in a clear and compact way in this framework. The effects of interaction with the external environment will be discussed for different injected electronic wave-packet, commenting about their robustness against decoherence and relaxation. Recent results concerning the extension of these ideas to helical edge states of the quantum spin Hall effect will be also presented.