Table 3 Error analysis for the two-qubit CZ gate between pairs (Q1,Q2).

Contributions to the average infidelity estimated from QPT for several error channels.

Error channel or processContribution to average
infidelity bound (≤%)
Decoherence6.5
State preparation and measurement (SPAM) error0.2
Tomography rotations2.0
Leakage into |02〉6.0
Residual ZZ coupling1.9
Spurious sidebands0.03
Instrumentation drift1.0