Probing the quantum nature of electronic transport by sub-nanosecond time-resolved measurements*

Mesoscopic microwave measurements are usually carried out in the frequency domain. However, for some experiments involving large bandwidths (including frequency-resolved measurements) or short timescales (e.g. subcycle waveforms), the time domain can be a more suitable or convenient measurement framework.[1]

In this talk, we present ultrafast time-domain measurements of the noise emitted by a tunnel junction under DC and AC excitation. The measurements are done at 32 GSa/s with an analog bandwith of Δf = 10 GHz. We show that, at fixed time lag, the excess noise is an oscillating function of the bias voltage. It is thus possible to control noise correlations through the bias voltage. We also present recent advances in phase-resolved probing of the photoassisted noise.


[1] Stéphane Virally and Bertrand Reulet. Phys. Rev. A 100, 023833 (2019)