Fig. 9.

(A) Comparison of ground-state energy error $\left|\left(E_0-E_i\right)/E_0\right|$ and (B) ground-state overlap $\left|\langle {\mathrm{\Psi }}_0|{\mathrm{\Psi }}_i\rangle \right|$ as a function of N for Hamiltonians $H_{\text{eff},1}$ (black) and $H_{\text{eff},2}$ (red) with detuning $\delta /J_1=40$.