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Wright, Jerimiah; Gowrishankar, Meenambika; Claudino, Daniel; Lotshaw, Phillip C.; Nguyen, Thien; McCaskey, Alexander J.; Humble, Travis S.
Materials theory, 12/2022, Letnik: 6, Številka: 1Journal Article
The opportunities afforded by near-term quantum computers to calculate the ground-state properties of small molecules depend on the structure of the computational ansatz as well as the errors induced by device noise. Here we investigate the behavior of these noisy quantum circuits using numerical simulations to estimate the accuracy and fidelity of the prepared quantum states relative to the ground truth obtained by conventional means. We implement several different types of ansatz circuits derived from unitary coupled cluster theory for the purposes of estimating the ground-state energy of sodium hydride using the variational quantum eigensolver algorithm. We show how relative error in the energy and the fidelity scale with the levels of gate-based noise, the internuclear configuration, the ansatz circuit depth, and the parameter optimization methods.
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