Fig. 2: Singe qubit properties.

a Normalized transmission spectrum ∣t₀∣² of qubit 1 measured as a function of the modulation frequency Ω and the probe frequency ω at the fixed modulation amplitude A_V = 50 mV_pp. b Measured ∣t₀∣² of the modulated qubit with Ω/(2π) = 20 MHz for different A_m and fits to Eq. (1) (solid lines). c Measured resonance fluorescence emission spectrum of qubit 1 as a function of the modulation frequency Ω and detuning of the detected inelastically scattered radiation from the drive applied at ω₀ for a Rabi frequency Ω_R/(2π) = 52 MHz and modulation amplitude A_m = 0.2 Ω_R. d Theoretically predicted Mollow spectrum in the presence of frequency modulation for the same parameters. e Level splitting schematics of the dressed and modulated qubit, which explains the origin of the observed nested Mollow triplets at Ω = Ω_R.