a Off-resonant fluorescence emission spectrum as a function of the pump power at the qubit. The frequency of the pump field is detuned by Δ = ωp − ω01 = −2π*790 kHz from the qubit frequency. The Rabi splitting is increased with the input power. b Off-resonant fluorescence emission spectrum as a function of the frequency of the pump at Pq = −133 dBm. c Off-resonant PSD at Δ/2π = −790 kHz (green dots) with Pq = −133 dBm. The solid curve is a fit to Γ1/2π = 275 ± 6 kHz and Γϕ/2π = 3 ± 3 kHz. d Off-resonant PSD in a second cooldown at Δ/2π = 820 kHz (brown dots), Δ/2π = −830 kHz (green dots). A value of Γϕ/2π = 7 kHz gives a good fit to both traces (black).