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- W3208667952 abstract "Classical algorithms for predicting the equilibrium geometry of strongly correlated molecules require expensive wave function methods that become impractical already for few-atom systems. In this work, we introduce a variational quantum algorithm for finding the most stable structure of a molecule by explicitly considering the parametric dependence of the electronic Hamiltonian on the nuclear coordinates. The equilibrium geometry of the molecule is obtained by minimizing a more general cost function that depends on both the quantum circuit and the Hamiltonian parameters, which are simultaneously optimized at each step. The algorithm is applied to find the equilibrium geometries of the ${mathrm{H}}_{2},$ ${mathrm{H}}_{3}{}^{+},$ ${mathrm{BeH}}_{2},$ and ${mathrm{H}}_{2}mathrm{O}$ molecules. The quantum circuits used to prepare the electronic ground state for each molecule were designed using an adaptive algorithm where excitation gates in the form of Givens rotations are selected according to the norm of their gradient. All quantum simulations are performed using the PennyLane library for quantum differentiable programming. The optimized geometrical parameters for the simulated molecules show an excellent agreement with their counterparts computed using classical quantum chemistry methods." @default.
- W3208667952 created "2021-11-08" @default.
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- W3208667952 date "2021-11-02" @default.
- W3208667952 modified "2023-09-24" @default.
- W3208667952 title "Variational quantum algorithm for molecular geometry optimization" @default.
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- W3208667952 doi "https://doi.org/10.1103/physreva.104.052402" @default.
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