Fig. 3. Estimates of Pauli fidelities of IBM’s CNOT gate via standard CB (left) and CB with interleaved gates (right), using circuits shown in Fig. 1.

Data are collected from ibmq_montreal on 2022-03-23. Each Pauli fidelity is fitted using seven different circuit depths L = [2, 2², . . . , 2⁷]. For each depth C = 60 random circuits and 1000 shots of measurements are used. Throughout this paper, the error bar represents the standard error.