  We use the open kicked rotator to model the chaotic scattering in a ballistic
quantum dot coupled by two point contacts to electron reservoirs. By
calculating the system-size-over-wave-length dependence of the shot noise power
we study the crossover from wave to particle dynamics. Both a fully quantum
mechanical and a semiclassical calculation are presented. We find numerically
in both approaches that the noise power is reduced exponentially with the ratio
of Ehrenfest time and dwell time, in agreement with analytical predictions.
