Electron wave packet evolution under the influence of random electric   field
  We consider an electron wave packet evolution in the external deterministic electric field with Gaussian white noise addition. An explicit expression was given for the averaged probability flux with Gaussian initial wave function. We show that the noise addition increases wave packet spreading rate, which has a significant influence on flux amplitude and may play both destructive and constructive role. This depends on the form and amplitude of external deterministic field. 
D.I. Kulik, S.I. Pavlik, Yu. S. Oseledchik
quant-ph