Fig. 4: Cross resonance gate simulations.
From: Bootstrapping quantum process tomography via a perturbative ansatz
Simulated trace distance between the three-qubit Choi state for the simulated CR-CNOT with coherent error and either the PAPA reconstructed Choi state (black +) or the ideal gate (red ×), as a function of over-rotation error (angle β) and stray ZZ-coupling (angle ϕ), see Eq. (17).
