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The study of light-matter interaction at the quantum scale has been enabledby the cavity quantum electrodynamics (CQED) architecture, in which a quantumtwo-level system strongly couples to a single cavity mode. Originallyimplemented with atoms in optical cavities, CQED effects are now also observedwith artificial atoms in solid-state environments. Such realizations of thesesystems exhibit fast dynamics, which makes them attractive candidates fordevices including modulators and sources in high-throughput communications.However, these systems possess large photon out-coupling rates that obscure anyquantum behavior at large excitation powers. Here, we have utilised aself-homodyning interferometric technique that fully employs the complex modestructure of our nanofabricated cavity to observe a quantum phenomenon known asthe dynamic Mollow triplet. We expect this interference to facilitate thedevelopment of arbitrary on-chip quantum state generators, thereby stronglyinfluencing quantum lithography, metrology, and imaging.

Self-homodyne measurement of a dynamic Mollow triplet in the solid state