  We use optimal control theory to obtain shortcuts to adiabaticity which
maximize population transfer in a three-level STIRAP system, for a given finite
duration of the process and specified dissipation rate at the intermediate
state. We fix the sum of the intensities of the pump and Stokes pulses and use
the mixing angle as the sole control variable. We determine the optimal
variation of this angle and reveal the role of singular arc in the optimal
trajectory, in order to minimize the effect of dissipation.

Quantum Physics