  We consider quantum statistics of charge transmitted through a mesoscopic
device in the adiabatic pumping process. A general formula for the distribution
function of the transmitted charge in terms of the time-dependent S-matrix is
obtained. It is applied to a few simple examples of the pumping cycles. We
identify coherent pumping strategies which lead to the binomial charge
distribution and minimize the fluctuations of the pumped current. Conditions
for the ideal noiseless quantized pump are discussed.
