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A time-dependent electromagnetic field creates electron-hole excitations in aFermi sea at low temperature. We show that the electron-hole pairs can begenerated in a controlled way using harmonic and biharmonic time-dependentvoltages applied to a quantum contact and obtain the probabilities of the paircreations. For a biharmonic voltage drive, we find that the probability of apair creation decreases in the presence of an in-phase second harmonic. Thisaccounts for the suppression of the excess noise observed experimentally[Gabelli and Reulet, arXiv:1205.3638] proving that dynamic control anddetection of elementary excitations in quantum conductors are within the reachof the present technology.

Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact