We use a laser-driven single (In,Ga)As quantum dot (QD) in the dressed-state regime of resonance fluorescence $(T=4\text{K})$ to observe the four $D_1$-transition lines of alkali atomic cesium $\left(\mathrm{Cs}\right)$ vapor at room temperature. We tune the frequency of the dressing continuous-wave laser in the vicinity of the bare QD resonance $\sim 335.116\mathrm{THz}$ $(\sim 894.592\mathrm{nm})$ at constant excitation power and thereby controllably tune the center and side channel frequencies of the probe light, i.e., the Mollow triplet. Resonances between individual QD Mollow triplet lines and the atomic hyperfine-split transitions are clearly identified in the $\mathrm{Cs}$ absorption spectrum. Our results show that narrow-band (In,Ga)As QD resonance fluorescence (RF) is suitable to optically address individual transitions of the $D_1$ quadruplet without applying magnetic field or electric field tuning.

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