The variational quantum eigensolver is a prominent hybrid quantum-classical algorithm expected to impact near-term quantum devices. They are usually based on a circuit ansatz consisting of parameterized single-qubit gates and fixed two-qubit gates. We study the effect of parameterized two-qubit gates in the variational quantum eigensolver. We simulate a variational quantum eigensolver algorithm using fixed and parameterized two-qubit gates in the circuit ansatz and show that the parameterized versions outperform the fixed versions, both when it comes to best energy and reducing outliers, for a range of Hamiltonians with applications in quantum chemistry and materials science.
@article{arxiv.2203.04978,
title = {Parameterized Two-Qubit Gates for Enhanced Variational Quantum Eigensolver},
author = {S. E. Rasmussen and N. T. Zinner},
journal= {arXiv preprint arXiv:2203.04978},
year = {2022}
}