  We propose a new method for pure-state and subspace preparation in quantum
systems, which employs the output of a continuous measurement process and
switching dissipative control to improve convergence speed, as well as
robustness with respect to the initial conditions. In particular, we prove that
the proposed closed-loop strategy makes the desired target globally
asymptotically stable both in mean and almost surely, and we show it compares
favorably against a time-based and a state-based switching control law, with
significant improvements in the case of faulty initialization.
