For the Wigner simulation we use inflow boundary conditions which
are modeled by Dirichlet type boundary conditions in -space.
In the coherent case these are only an approximation to
the absorbing boundary conditions
as applied in the quantum transmitting boundary method.
More specifically: in the Wigner model the inflow is
prescribed as the Wigner equilibrium distribution,
and outgoing waves appear to be partially reflected at the
boundaries. Improved boundary conditions were suggested
in [RFK89].
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