Benchmarking VQE for the square-octagon-lattice Kitaev model [Slides\
Andy C. Y. Li, M. Alam, Thomas Iadecola, Ammar Jahin, Dog̃a Murat Kürkçüog̃lu, Richard Li, Peter P. Orth, Ahmet Barış Özgüler, Gabriel Perdue, Norm M. Tubman · 2022
hardware-native square-octagon qubit connectivity map, and examine the possibility of efficiently probing its rich phase diagram with VQE approaches. By benchmarking different choices of variational ansatz states and classical optimizers, we illustrate the advantage of a mixed optimization approach using the Hamiltonian variational ansatz (HVA). We further demonstrate the implementation of an HVA circuit on Rigetti's Aspen-9 chip with error mitigation.