Agradecimentos: Y.K., R.S., F.K., V.R., and G.W. acknowledge the financial support through the Austrian Science Fund (FWF) projects with Grant DOIs 10.55776/TAI556 (DarkEneT), 10.55776/W1259 (DK-ALM Atoms, Light, and Molecules), 10.55776/FG5, 10.55776/I4380 (AEQuDot), 10.55776/COE1 (quantA), and the infrastructure funding from FFG (HuSQI Grant No. FO999896024). D.A.V. and T.H. acknowledge financial support by the German Federal Ministry of Education and Research (BMBF) via the project "QuSecure" (Grant No. 13N14876) within the funding program Photonic Research Germany, and the BMBF joint project "tubLAN Q.0" (Grant No. 16KISQ087K). T.K.B. and D.E.R. acknowledge financial support from the German Research Foundation DFG through Project No. 428026575 (AEQuDot). R.G.K., D.R., and S.N. acknowledge financial support from the German Federal Ministry of Education and Research through Project No. 13N16028 (MHLASQU) and the German Research Foundation DFG (Nos. 455425131, OH-SUPER and 448663633, fs2CVBG). A.R. and S.F.C.d.S. acknowledge the FWF Project Nos. FG 5, P 30459, and I 4320, the Linz Institute of Technology (LIT) and the European Union's Horizon 2020 research, and innovation program under Grant Agreement Nos. 899814 (Qurope) and 871130 (ASCENT+), and the QuantERA II Programme (Project No. QD-E-QKD). For open access purposes, the authors have applied a CC BY public copyright license to any author accepted manuscript version arising from this submission Ver menos

Abstract: The generation of single photons using solid-state quantum emitters is pivotal for advancing photonic quantum technologies, particularly in quantum communication. As the field continuously advances toward practical use cases and beyond shielded laboratory environments, specific demands are placed on the robustness of quantum light sources during operation. In this context, the robustness of the quantum light generation process against intrinsic and extrinsic effects is a major challenge. Here, we present a robust scheme for the coherent generation of indistinguishable single-photon states with very low photon number coherence using a three-level system in a semiconductor quantum dot. Our approach combines the advantages of adiabatic rapid passage and stimulated two-photon excitation. We demonstrate robust quantum light generation while maintaining the prime quantum-optical quality of the emitted light state. Moreover, we highlight the immediate advantages of the implementation of various quantum cryptographic protocols Ver menos