Extended Data Fig. 2: Quasiparticle injection experiment.
From: Impact of ionizing radiation on superconducting qubit coherence
a, The pulse sequence in the quasiparticle injection experiment. First, a strong microwave pulse is applied for the duration of dqp to the resonator, which excites quasiparticles. After time tqp, the energy-relaxation time of the qubit is measured. b, The energy-relaxation rate of the qubit Q1 during the quasiparticle injection experiment (blue dots). A solid green line shows a fit to the data using the full model that includes quasiparticle trapping and recombination. Orange dash-dotted line shows the model with only recombination; dotted line shows the same model without the internal quasiparticle relaxation rate Γother. Blue dash-dotted line shows the fit to the model that only includes trapping of quasiparticles. Dotted blue line shows the trapping model without Γother.
