VQE for the square-octagon-lattice Kitaev model [Slides]
Andy C. Y. Li, M. Sohaib Alam, Thomas Iadecola, Alexandru Macridin, Dog̃a Murat Kürkçüog̃lu, Richard Li, Peter P. Orth, Ammar Jahin, A. 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) and the potential of probing the system's phase diagram using VQE. We further demonstrate the implementation of HVA circuits on Rigetti's Aspen-9 chip with error mitigation.