James Mcdonagh, Stamatia Zavitsanou, et al.
Digital Discovery
Interactions between electrons and phonons play a crucial role in quantum materials. Yet, there is no universal method that would simultaneously accurately account for strong electron-phonon interactions and electronic correlations. By combining methods of the variational quantum eigensolver and the variational non-Gaussian solver, we develop a hybrid quantum-classical algorithm suitable for this type of correlated systems. This hybrid method tackles systems with arbitrarily strong electron-phonon coupling without increasing the number of required qubits and quantum gates, as compared to purely electronic models. We benchmark our method by applying it to the paradigmatic Hubbard-Holstein model at half filling, and show that it correctly captures the competition between charge density wave and antiferromagnetic phases, quantitatively consistent with exact diagonalization.
James Mcdonagh, Stamatia Zavitsanou, et al.
Digital Discovery
Thanh Lam Hoang, Marco Luca Sbodio, et al.
AAAI 2024
Valery Weber, Cristiano Malossi, et al.
ISC 2016
Leonard-Alexander Lieske, Mario Commodo, et al.
ACS Nano