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We report measurements of shot noise in a tunnel junction under bi-harmonicillumination, Vac(t) = Vac1 cos(2\pi ft) + Vac2 cos(4\pi ft+ \phi). Theexperiment is performed in the quantum regime, hf >> k_BT at low temperature T= 70 mK and high frequency f = 10 GHz. From the measurement of noise at lowfrequency, we show that we can infer and control the non-equilibrium electronicdistribution function by adjusting the amplitudes and phase of the excitation,thus modeling its shape. In particular, we observe that the noise depends notonly on the amplitude of the two sine waves but also on their relative phase,due to coherent emission/absorption of photons at different frequencies. Byshaping the excitation we can minimize the noise of the junction, which nolonger reaches its minimum at zero dc bias. We show that adding an excitationat frequency 2f with the proper amplitude and phase can reduce the noise of thejunction excited at frequency f only.

Shaping a time-dependent excitation to control the electron distribution function: noise minimization in a tunnel junction