  We propose a directional coupler exploiting the framework of adiabatic
passage for two level atomic systems with configuration dependent Allen-Eberly
scheme. Recently developed shortcut to adiabatic passage method (STA), which
uses transitionless quantum driving algorithm, is applied to the coupler. The
study shows that it is possible to reduce the device length significantly using
STA, keeping the efficiency of power transfer100%.Shortcut approach shows much
superiority in terms of robustness and fidelity in power switching compared to
the adiabatic one.
