Fig. 3: Color plots representing the energy accuracy (from FCI) at different gate-error probabilities and ansatz lengths.
From: Quantifying the effect of gate errors on variational quantum eigensolvers for quantum chemistry
Plotted for three different molecules: H4 (at 1 Å (a) and 3 Å (b) interatomic separation) and LiH (c). Three iterative-growth methods are included: the fermionic-ADAPT-VQE with efficient elements, the QEB-ADAPT-VQE with the energy decision rule and the qubit-ADAPT-VQE (the plots for the remaining two methods are given in Supplementary Note 2). The yellow lines on the color plot highlight the ansatz lengths that minimize the energy accuracies for each gate-error probability. The top-column figures are extracted from the color plots by plotting the energy accuracy along these curves.
