The paper explores the possibility of creating ansatz wave-functions for the variational quantum eigensolver that are much more compact than ADAPT-VQE while achieving chemical accuracy. The proposed Overlap-ADAPT-VQE combined with the classical selected-CI approach can reach chemical accuracy for a stretched linear H6 chain using an ansatz with only 40 operators compared to more than 150 for ADAPT-VQE.
- César Feniou
- Muhammad Hassan
- Jean-Philip Piquemal
