  A fractional quantum Hall liquid with multiple edges is considered. The
computation of transport quantities such as current, noise and noise cross
correlations in such multiple edge samples requires the implementation of so
called Klein factors, which insure the correct quasiparticle exchange
properties. The commutation relations of these factors are obtained by closing
the system into a single edge. The non-equilibrium Green's function formalism
associated with such factors is derived for a simple Laughlin fraction of the
Hall effect. It is shown explicitly how Klein factors enter the calculation of
the noise cross correlations, as well as the correction to the Poisson limit
for the noise.

Mesoscale and Nanoscale Physics