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Variational Quantum Eigensolver with Mutual Variance-Hamiltonian Optimization |
| Bin-Lin Chen1 and Dan-Bo Zhang1,2* |
1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
2Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, Guangzhou 510006, China
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| Cite this article: |
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Bin-Lin Chen and Dan-Bo Zhang 2023 Chin. Phys. Lett. 40 010303 |
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Abstract The zero-energy variance principle can be exploited in variational quantum eigensolvers for solving general eigenstates but its capacity for obtaining a specified eigenstate, such as ground state, is limited as all eigenstates are of zero energy variance. We propose a variance-based variational quantum eigensolver for solving the ground state by searching in an enlarged space of wavefunction and Hamiltonian. With a mutual variance-Hamiltonian optimization procedure, the Hamiltonian is iteratively updated to guild the state towards to the ground state of the target Hamiltonian by minimizing the energy variance in each iteration. We demonstrate the performance and properties of the algorithm with numeral simulations. Our work suggests an avenue for utilizing guided Hamiltonian in hybrid quantum-classical algorithms.
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Received: 08 September 2022
Published: 03 January 2023
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| PACS: |
03.67.Ac
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(Quantum algorithms, protocols, and simulations)
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