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We use a laser-driven single (In,Ga)As quantum dot (QD) in the dressed stateregime of resonance fluorescence ($T = 4$ K) to observe the four$D_1$-transition lines of alkali atomic cesium ($Cs$) vapor at roomtemperature. We tune the frequency of the dressing continuous-wave laser in thevicinity of the bare QD resonance $\sim 335.116$ THz ($\sim 894.592$ nm) atconstant excitation power and thereby controllably tune the center and sidechannel frequencies of the probe light, i.e. the Mollow triplet. Resonancesbetween individual QD Mollow triplet lines and the atomic hyperfine-splittransitions are clearly identified in the $Cs$ absorption spectrum. Our resultsshow that narrow-band (In,Ga)As QD resonance fluorescence (RF) is suitable tooptically address individual transitions of the $D_1$ quadruplet withoutapplying magnetic field or electric field tuning.

Spectroscopy of the D1-transition of cesium by dressed-state resonance fluorescence from a single (In,Ga)As/GaAs quantum dot