  Using a new developed Single-Electron approach, we derive the Landauer-type
formula for electron transport in arbitrary time-dependent potentials. This
formula is applied for randomly fluctuating potentials represented by a
dichotomic noise. We found that the noise can produce dc-current in quantum
system under zero-bias voltage by breaking the time-reversal symmetry of the
transmission coefficient. We show that this effect is due to decoherence,
produced by the noise, which can take place in many different systems.
