Giant Spin Model for Stimulated Raman Adiabatic Passage of systems interacting with a fermionic environment

Stimulated Raman Adiabatic Passage is analyzed in the case where the physical system manipulated by such technique is interacting with a spin bath. The efficiency of the population transfer process is investigated in several regimes, including the weak and strong coupling with the environment and the off-resonance. The occurrence of a generalized quantum Zeno effect explains the lowering of the efficiency in the strong damping regime.