Fig. 3. Region of accurate simulation and resolvable dynamics.

a Our QA experiments are parameterized by annealing parameter s and physical temperature T; these map to the familiar (T/J, Γ/J) plane as shown. b Estimates of $⟨m⟩$ are shown for QA and PIMC quenched samples for a range of T and s. c QA deviation from PIMC estimates is shown. When relaxation is extremely fast, order in the system is severely overestimated due to ordering during the readout quench. The white region falls within a tolerance of 0.03 of the ground truth, which corresponds to our “accurate simulation” region in a. At low T and high s, transverse field is small and ordering is weak, and therefore easily suppressed by inhomogeneities in the processor. d We cannot resolve convergence timescales faster than 1 μs. Our parameter range is therefore further restricted, excluding the fastest-converging models, i.e., those with high T and low s, shown in white.