Ab initio molecular dynamics on quantum computers
Journal Article
·
· Journal of Chemical Physics
- Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
Ab initio molecular dynamics (AIMD) is a valuable technique for studying molecules and materials at finite temperatures where the nuclei evolve on potential energy surfaces obtained from accurate electronic structure calculations. In this work, we present an approach to running AIMD simulations on noisy intermediate-scale quantum (NISQ)-era quantum computers. The electronic energies are calculated on a quantum computer using the variational quantum eigensolver (VQE) method. Algorithms for computation of analytical gradients entirely on a quantum computer require quantum fault-tolerant hardware, which is beyond NISQ-era. Therefore, we compute the energy gradients numerically using finite differences, the Hellmann-Feynman theorem, and a correlated sampling technique. This method only requires additional classical calculations of electron integrals for each degree of freedom without any additional computations on a quantum computer beyond the initial VQE run. As a proof of concept, AIMD simulations are demonstrated for the H-2 molecule on IBM quantum devices. In addition, we demonstrate the validity of the method for larger molecules using full configuration interaction wave functions. As quantum hardware and noise mitigation techniques continue to improve, the method can be utilized for studying larger molecular systems.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1798042
- Alternate ID(s):
- OSTI ID: 1780355
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 16 Vol. 154; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ab-initio molecular dynamics
Active noise control
Computer simulation
Electronic structure methods
Full configuration interaction
Hellmann Feynman theorem
Potential energy surfaces
Quantum computing
Quantum measurement theory
Stochastic processes
Ab-initio molecular dynamics
Active noise control
Computer simulation
Electronic structure methods
Full configuration interaction
Hellmann Feynman theorem
Potential energy surfaces
Quantum computing
Quantum measurement theory
Stochastic processes