Fig. 3: Optically driving the radiative Auger transition.
a The level scheme where one laser (ω1) with Rabi frequency Ω1 drives the fundamental transition (\(\left|s\right\rangle\)–\(\left|t\right\rangle\)) while a second laser (ω2) drives the radiative Auger transition (\(\left|p\right\rangle\)–\(\left|t\right\rangle\)) with Rabi frequency Ω2. b Resonance fluorescence (Ω1 = 2π × 0.08 GHz) as a function of detuning Δ2 (detuning of ω2). At low values of Ω2, the resonance fluorescence intensity is almost constant for different values of Δ2. For the highest value of Ω2, the resonance fluorescence drops by up to ~ 70% on bringing ω2 into resonance with the radiative Auger transition. The strong fluorescence dip at a particular frequency is a characteristic feature of a Λ-system driven with two lasers that are detuned in frequency by the ground state splitting. c Resonance fluorescence at Δ2 = 0 as a function of Ω2. The resonance fluorescence intensity (blue dots) drops with increasing Ω2, fitting well to the theoretical model (black line). d Fluorescence intensity as a function of detuning Δ2. The Rabi frequencies are Ω1 = 2π × 0.27 GHz, Ω2 = 2π × 2.1 GHz. The same measurement is repeated for a series of fixed detunings Δ1 (detuning of ω1 from the fundamental transition). Detuning ω1 leads to an asymmetric fluorescence dip. This asymmetry is well captured by our quantum optics simulations (black lines) based on the level scheme shown in (a). e Fluorescence intensity as a function of laser detunings Δ1, Δ2. f Simulation of the fluorescence intensity as a function of the laser detunings.
