Quantum Simulation of Molecules in Solution

Overview

Journal J Chem Theory Comput

Publisher American Chemical Society

Specialties Biochemistry
Chemistry

Date 2022 Nov 9

PMID 36351289

Authors

Davide Castaldo

Soran Jahangiri

Alain Delgado

Stefano Corni

Affiliations

Soon will be listed here.

Abstract

Quantum chemical calculations on quantum computers have been focused mostly on simulating molecules in the gas phase. Molecules in liquid solution are, however, most relevant for chemistry. Continuum solvation models represent a good compromise between computational affordability and accuracy in describing solvation effects within a quantum chemical description of solute molecules. In this work, we extend the variational quantum eigensolver to simulate solvated systems using the polarizable continuum model. To account for the state dependent solute-solvent interaction we generalize the variational quantum eigensolver algorithm to treat non-linear molecular Hamiltonians. We show that including solvation effects does not impact the algorithmic efficiency. Numerical results of noiseless simulations for molecular systems with up to 12 spin-orbitals (qubits) are presented. Furthermore, calculations performed on a simulated noisy quantum hardware (IBM Q, Mumbai) yield computed solvation free energies in fair agreement with the classical calculations.

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