  A mesoscopic Coulomb blockade system with two identical transport channels is
studied in terms of full counting statistics. It is found that the average
current cannot distinguish the quantum constructive interference from the
classical non-interference, but the shot noise and skewness are more sensitive
to the nature of quantum mechanical interference and can fulfill that task. The
interesting super-Poisson shot noise is found and is demonstrated as a
consequence of constructive interference, which induces an effective system
with fast-and-slow transport channels. Dephasing effects on the counting
statistics are carried out to display the continuous transition from quantum
interfering to non-interfering transports.
