A full circuit-based quantum algorithm for excited-states in quantum chemistry

Fuente: arXiv
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Auteurs principaux: Wen, Jingwei, Wang, Zhengan, Chen, Chitong, Xiao, Junxiang, Li, Hang, Qian, Ling, Huang, Zhiguo, Fan, Heng, Wei, Shijie, Long, Guilu
Format: Preprint
Publié: 2021
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author Wen, Jingwei
Wang, Zhengan
Chen, Chitong
Xiao, Junxiang
Li, Hang
Qian, Ling
Huang, Zhiguo
Fan, Heng
Wei, Shijie
Long, Guilu
author_facet Wen, Jingwei
Wang, Zhengan
Chen, Chitong
Xiao, Junxiang
Li, Hang
Qian, Ling
Huang, Zhiguo
Fan, Heng
Wei, Shijie
Long, Guilu
contents Utilizing quantum computer to investigate quantum chemistry is an important research field nowadays. In addition to the ground-state problems that have been widely studied, the determination of excited-states plays a crucial role in the prediction and modeling of chemical reactions and other physical processes. Here, we propose a non-variational full circuit-based quantum algorithm for obtaining the excited-state spectrum of a quantum chemistry Hamiltonian. Compared with previous classical-quantum hybrid variational algorithms, our method eliminates the classical optimization process, reduces the resource cost caused by the interaction between different systems, and achieves faster convergence rate and stronger robustness against noise without barren plateau. The parameter updating for determining the next energy-level is naturally dependent on the energy measurement outputs of the previous energy-level and can be realized by only modifying the state preparation process of ancillary system, introducing little additional resource overhead. Numerical simulations of the algorithm with hydrogen, LiH, H2O and NH3 molecules are presented. Furthermore, we offer an experimental demonstration of the algorithm on a superconducting quantum computing platform, and the results show a good agreement with theoretical expectations. The algorithm can be widely applied to various Hamiltonian spectrum determination problems on the fault-tolerant quantum computers.
format Preprint
id arxiv_https___arxiv_org_abs_2112_14193
institution arXiv
publishDate 2021
record_format arxiv
spellingShingle A full circuit-based quantum algorithm for excited-states in quantum chemistry
Wen, Jingwei
Wang, Zhengan
Chen, Chitong
Xiao, Junxiang
Li, Hang
Qian, Ling
Huang, Zhiguo
Fan, Heng
Wei, Shijie
Long, Guilu
Quantum Physics
Utilizing quantum computer to investigate quantum chemistry is an important research field nowadays. In addition to the ground-state problems that have been widely studied, the determination of excited-states plays a crucial role in the prediction and modeling of chemical reactions and other physical processes. Here, we propose a non-variational full circuit-based quantum algorithm for obtaining the excited-state spectrum of a quantum chemistry Hamiltonian. Compared with previous classical-quantum hybrid variational algorithms, our method eliminates the classical optimization process, reduces the resource cost caused by the interaction between different systems, and achieves faster convergence rate and stronger robustness against noise without barren plateau. The parameter updating for determining the next energy-level is naturally dependent on the energy measurement outputs of the previous energy-level and can be realized by only modifying the state preparation process of ancillary system, introducing little additional resource overhead. Numerical simulations of the algorithm with hydrogen, LiH, H2O and NH3 molecules are presented. Furthermore, we offer an experimental demonstration of the algorithm on a superconducting quantum computing platform, and the results show a good agreement with theoretical expectations. The algorithm can be widely applied to various Hamiltonian spectrum determination problems on the fault-tolerant quantum computers.
title A full circuit-based quantum algorithm for excited-states in quantum chemistry
topic Quantum Physics
url https://arxiv.org/abs/2112.14193