Fig. 5: Error in energy and leakage for HeH+.
From: Gate-free state preparation for fast variational quantum eigensolver simulations
Energy difference shown between ctrl-VQE and FCI (top) and leakage (bottom) along the time evolution steps with optimal pulses of different durations for HeH+ with a bond distance of 0.90 Å. Optimized pulse parameters are provided in the SI.
