STIRAP Three-Level Dark State
Follow a three-level dark eigenstate while checking the gap required for adiabatic passage.
Free theory articleFollow a three-level dark eigenstate while checking the gap required for adiabatic passage.
Concept & interpretation
Stimulated Raman Adiabatic Passage (STIRAP) utilizes a counterintuitive sequence of two optical pulses (Stokes followed by Pump) to transfer population between two states via an intermediate state. The process relies on following a three-level dark eigenstate that has no amplitude in the intermediate state, thereby preventing spontaneous emission and ensuring a robust transfer.
Native experiment
Open the STIRAP Three-Level Dark State interactive tool to observe the eigenstates and energy levels.
- Set Mixing degrees to 30, Total coupling to 1, and Middle detuning to 0. Notice how the Pump coupling decreases while the Stokes coupling increases. The dark amplitude for state |1> becomes larger than for state |3>. The dark gap remains at 0.5.
- Change the Middle detuning to 1. The bright state energies shift to -0.20710678118654757 and 1.2071067811865475. The minimum dark gap decreases to approximately 0.2071, making the adiabatic passage more sensitive.
- Set the Total coupling to 0. The system reaches a degenerate uncoupled limit where the dark amplitudes are unavailable, and the gap collapses to 0.