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Resonance fluorescence of two-level quantum systems has emerged as a powerfultool in quantum information processing. Extension of this approach tohigher-level systems provides new opportunities for quantum opticsapplications. Here we introduce a coherent driving scheme of a three-levelladder system utilizing Autler-Townes and ac Stark effects by resonantexcitation with two laser fields. We propose theoretically and demonstrateexperimentally the feasibility of this approach towards all-optical spectraltuning of quantum dot-based single-photon sources and investigate photonindistinguishability and purity levels. Our tuning technique allows for fastoptical control of the quantum emitter spectrum which paves the way towardstemporal and spectral shaping of the single photons, formation of topologicalFloquet states or generation of high-dimensional frequency-encoded quantumstates of light.

All-optical Tuning of Indistinguishable Single-Photons Generated in Three-level Quantum Systems