  Quantum resonance is one of the main characteristics of the quantum kicked
rotor, which has been used to induce accelerated ratchet current of the
particles with a generalized asymmetry potential. Here we show that by
desynchronizing the kicked potentials of the flashing ratchet [Phys. Rev. Lett.
94, 110603 (2005)], new quantum resonances are stimulated to conduct directed
currents more efficiently. Most distinctly, the missed resonances
$\kappa=1.0\pi$ and $\kappa=3.0\pi$ are created out to induce even larger
currents. At the same time, with the help of semiclassical analysis, we prove
that our result is exact rather than phenomenon induced by errors of the
numerical simulation. Our discovery may be used to realize directed transport
efficiently, and may also lead to a deeper understanding of symmetry breaking
for the dynamical evolution.
