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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Simulating chemical reaction dynamics on quantum computer.

Qiankun Gong1, Qingmin Man1, Jianyu Zhao1

  • 1Origin Quantum Computing Company Limited, Hefei, Anhui 230026, China.

The Journal of Chemical Physics
|March 25, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an enhanced quantum algorithm for simulating molecular dynamics, achieving high accuracy for chemical reactions. The method is resource-efficient, making it suitable for current quantum computers.

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Area of Science:

  • Quantum chemistry
  • Computational chemistry
  • Molecular dynamics

Background:

  • Quantum computers can calculate molecular electronic energies.
  • Simulating molecular dynamics is crucial for practical applications.
  • Previous work demonstrated vibrational dynamics using a correlated sampling (CS) method on a variational quantum eigensolver (VQE).

Purpose of the Study:

  • To develop a quantum approach for simulating chemical reaction dynamics.
  • To extend the CS method for calculating energy gradients.
  • To enable high-precision simulation of chemical reactions on quantum devices.

Main Methods:

  • Developed an extended correlated sampling method based on the VQE algorithm (eCS-VQE).
  • Extended CS for calculating first-order and second-order energy gradients.
  • Applied the method to H2, LiH, H+ + H2, and Cl- + CH3Cl systems.

Main Results:

  • Achieved accuracy comparable to the Coupled Cluster Singles Doubles (CCSD) level.
  • Successfully simulated hydrogen exchange and chlorine substitution reaction dynamics.
  • Obtained high-precision reaction dynamics trajectories consistent with classical methods.

Conclusions:

  • The eCS-VQE approach is a feasible method for chemical reaction dynamics simulation on current quantum computers.
  • The method is less demanding on quantum resources due to reusable measurement expectations and wave functions.
  • Enables precise simulation of complex chemical processes in the noisy intermediate-scale quantum era.