  Electron interference in mesoscopic devices irradiated by external
non-classical microwaves, is considered. In the case of one-mode microwaves, it
is shown that both the average intensity and the spectral density of the
interfering electrons are sensitive to the quantum noise of the microwaves. The
results for various quantum states of the microwaves are compared and
contrasted with the classical case. Separable and entangled two-mode microwaves
are also considered and their effect on electron average intensity and
autocorrelation, is discussed.
