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We investigate the noise properties of a GaAs/AlGaAs resonant tunnelingstructure at bias voltages where the current characteristic is determined bysingle electron tunneling. We discuss the suppression of the shot noise in theframework of a coupled two-state system. For large bias voltages we observedsuper-Poissonian shot noise up to values of the Fano factor $\alpha \approx10$.Comment: 4 pages, 4 figures, accepted for Phys. Rev.

Shot noise in resonant tunneling through a zero-dimensional state with a complex energy spectrum