Stimulated Raman Adiabatic Passage in a three-level Λ system
|1⟩: 1.000|2⟩: 0.000|3⟩: 0.000t: 0.00
STIRAP transfers population from state |1⟩ to |3⟩ without ever populating the intermediate "lossy" state |2⟩.
The trick: the Stokes pulse (|2⟩→|3⟩) is applied before the pump pulse (|1⟩→|2⟩) —
the counterintuitive sequence. The system follows the dark state |D⟩ = cos θ|1⟩ − sin θ|3⟩ adiabatically.
Adjust the pulse delay to see how robustness degrades.