  A PT-symmetric Bose-Einstein condensate can be theoretically described using
a complex optical potential, however, the experimental realization of such an
optical potential describing the coherent in- and outcoupling of particles is a
nontrivial task. We propose an experiment for a quantum mechanical realization
of a PT-symmetric system, where the PT-symmetric currents of a two-well system
are implemented by coupling two additional wells to the system, which act as
particle reservoirs. In terms of a simple four-mode model we derive conditions
under which the two middle wells of the Hermitian four-well system behave
exactly as the two wells of the PT-symmetric system. We apply these conditions
to calculate stationary solutions and oscillatory dynamics. By means of frozen
Gaussian wave packets we relate the Gross-Pitaevskii equation to the four-mode
model and give parameters required for the external potential, which provides
approximate conditions for a realistic experimental setup.
