Enhancement of quantum tunneling oscillations due to nonlinear interactions - art. no. 033601

We show that atomic-tunneling oscillations between two Bose-Einstein conden sates can be increased as well as decreased by preparing the appropriate in itial conditions and the nonlinear self-interaction. There is a trade-off r elation between the oscillation amplitudes and the frequencies: smaller the oscillation amplitudes, higher the oscillation frequencies. The trajectory of the state vector on the Bloch sphere gives us an intuitive understandin g of the increase of the tunneling oscillations. Similar effect predicted i n this paper is expected for other nonlinear systems such as in the coupled quantum dots and waveguide coupling, in which the on-site energy and the s elf-phase-modulation, respectively, give rise to the nonlinear interactions .