Refining resource estimation for the quantum computation of vibrational molecular spectra through Trotter error analysis
1ExxonMobil Technology and Engineering Company, Annandale, NJ 08801, USA
2IBM Quantum, IBM Research Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
3IBM Quantum, IBM Research Almaden, San Jose, CA 95120, USA
4IBM Quantum, IBM T.J. Watson Research Center, Yorktown Heights, NY 10598, USA
| Published: | 2025-02-11, volume 9, page 1630 |
| Editor: | Álvaro Alhambra |
| Eprint: | arXiv:2311.03719v2 |
| Doi: | https://doi.org/10.22331/q-2025-02-11-1630 |
| Citation: | Quantum 9, 1630 (2025). |
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Abstract
Accurate simulations of vibrational molecular spectra are expensive on conventional computers. Compared to the electronic structure problem, the vibrational structure problem with quantum computers is less investigated. In this work we accurately estimate quantum resources, such as number of logical qubits and quantum gates, required for vibrational structure calculations on a programmable quantum computer. Our approach is based on quantum phase estimation and focuses on fault-tolerant quantum devices. In addition to asymptotic estimates for generic chemical compounds, we present a more detailed analysis of the quantum resources needed for the simulation of the Hamiltonian arising in the vibrational structure calculation of acetylene-like polyynes of interest. Leveraging nested commutators, we provide an in-depth quantitative analysis of trotter errors compared to the prior investigations. Ultimately, this work serves as a guide for analyzing the potential quantum advantage within vibrational structure simulations.
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