Tunneling through a coherent "quantum antidot molecule"

We report experiments on resonant tunneling through a quantum antidot in th e fractional quantum Hall regime. The envelope of the conductance peaks ind icates tunneling via two resonant states, one of them bound on the lithogra phic antidot, the other on a hill of the disorder potential. Moreover, our analysis indicates that the coherent tunneling rate between the two states is an order of magnitude higher than the phase breaking rate, thus giving e vidence for a coherently coupled "antidot molecule."