  In this work, we demonstrate the open-loop control of chaotic systems by
means of optimized periodic signals. The use of such signals enables us to
reduce control power significantly in comparison to simple harmonic
perturbations. It is found that the stabilized periodic dynamics can be changed
by small, specific alterations of the control signal. Thus, low power switching
between different periodic states can be achieved without feedback. The
robustness of the proposed control method against noise is discussed.
