Fast varying voltage sampling using single electron excitations within a Fabry-Perrot cavity*

We present the first experimental results towards the demonstration of an "electron radar", that is a proposal for measuring time dependent electric potentials on a very short (sub-ns) time scale using an electronic interferometer fed by single electron excitations. 

Here, we present new experimental results on the transfer of single electron wavepackets generated by Lorentzian current pulses (Levitons) through an electronic Fabry-Perot (FP) cavity. By applying a dc voltage to a plunger gate controlling the potential of the FP cavity, oscillations of the transmitted current are observed resulting from single electron interferences within the cavity. By modulating the plunger gate voltage in time, the ac potential can be sampled by tuning the time delay between single electron emission and the ac potential modulation.