We show how the charge input signal applied to the gate electrode in double and triple quantum dots may be converted to a pulse in the Kondo cotunneling current being a spin response of a nanodevice under a strong Coulomb blockade. The stochastic component of the input signal results in the infrared cutoff of Kondo transmission. The stochastization of the orbital component of the Kondo effect in triple quantum dots results in a noise-induced $\text{SU}\left(4\right)\to \text{SU}\left(2\right)$ quantum transition.

• Received 19 October 2009

DOI:https://doi.org/10.1103/PhysRevB.81.115330