Qudit Measurement on IBM Quantum Hardware

Sweep of readout-drive frequency for a ququart state, see Fig. 4.7(a).

Measurement of ququart states on ibm_lagos Q4 (July 7, 2023). Drive-frequency-dependent and qudit-state-dependent resonator amplitudes, the experimental equivalent of Fig. 4.2(a). The colored dots are the measurement results of all N = 2000 shots for each prepared Fock state for the drive frequency ω_d = ω₀ + Δω_d with ω₀/2π = 7.2463 GHz. The black crosses mark the centers of their Gaussian fits. The colored curves (with white shadows) correspond to the centers of Gaussian fits to the Fock states | j ⟩.