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In a radiative Auger process, optical decay is accompanied by simultaneousexcitation of other carriers. The radiative Auger process gives rise to weakred-shifted satellite peaks in the optical emission spectrum. These satellitepeaks have been observed over a large spectral range: in the X-ray emission ofatoms; close to visible frequencies on donors in semiconductors and quantumemitters; and at infrared frequencies as shake-up lines in two-dimensionalsystems. So far, all the work on the radiative Auger process has focussed ondetecting the spontaneous emission. However, the fact that the radiative Augerprocess leads to photon emission suggests that the transition can also beoptically excited. In such an inverted radiative Auger process, excitationwould correspond to simultaneous photon absorption and electronicde-excitation. Here, we demonstrate optical driving of the radiative Augertransition on a trion in a semiconductor quantum dot. The radiative Auger andthe fundamental transition together form a $\Lambda$-system. On driving bothtransitions of this $\Lambda$-system simultaneously, we observe a reduction ofthe fluorescence signal by up to $70\%$. Our results demonstrate a type ofoptically addressable transition connecting few-body Coulomb interactions toquantum optics. The results open up the possibility of carrying out THzspectroscopy on single quantum emitters with all the benefits of optics:coherent laser sources, efficient and fast single-photon detectors. In analogyto optical control of an electron spin, the $\Lambda$-system between theradiative Auger and the fundamental transitions allows optical control of theemitters' orbital degree of freedom.

Optically driving the radiative Auger transition