ADAPT-QSCI: Adaptive Construction of an Input State for Quantum-Selected Configuration Interaction
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866929623143546880 |
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| author | Nakagawa, Yuya O. Kamoshita, Masahiko Mizukami, Wataru Sudo, Shotaro Ohnishi, Yu-ya |
| author_facet | Nakagawa, Yuya O. Kamoshita, Masahiko Mizukami, Wataru Sudo, Shotaro Ohnishi, Yu-ya |
| contents | We present a quantum-classical hybrid algorithm for calculating the ground state and its energy of the quantum many-body Hamiltonian by proposing an adaptive construction of a quantum state for the quantum-selected configuration interaction (QSCI) method. QSCI allows us to select important electronic configurations in the system to perform CI calculation (subspace diagonalization of the Hamiltonian) by sampling measurement for a proper input quantum state on a quantum computer, but how we prepare a desirable input state has remained a challenge. We propose an adaptive construction of the input state for QSCI in which we run QSCI repeatedly to grow the input state iteratively. We numerically illustrate that our method, dubbed ADAPT-QSCI, can yield accurate ground-state energies for small molecules, including a noisy situation for eight qubits where error rates of two-qubit gates and the measurement are both as large as 1%. ADAPT-QSCI serves as a promising method to take advantage of current noisy quantum devices and pushes forward its application to quantum chemistry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_01105 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | ADAPT-QSCI: Adaptive Construction of an Input State for Quantum-Selected Configuration Interaction Nakagawa, Yuya O. Kamoshita, Masahiko Mizukami, Wataru Sudo, Shotaro Ohnishi, Yu-ya Quantum Physics We present a quantum-classical hybrid algorithm for calculating the ground state and its energy of the quantum many-body Hamiltonian by proposing an adaptive construction of a quantum state for the quantum-selected configuration interaction (QSCI) method. QSCI allows us to select important electronic configurations in the system to perform CI calculation (subspace diagonalization of the Hamiltonian) by sampling measurement for a proper input quantum state on a quantum computer, but how we prepare a desirable input state has remained a challenge. We propose an adaptive construction of the input state for QSCI in which we run QSCI repeatedly to grow the input state iteratively. We numerically illustrate that our method, dubbed ADAPT-QSCI, can yield accurate ground-state energies for small molecules, including a noisy situation for eight qubits where error rates of two-qubit gates and the measurement are both as large as 1%. ADAPT-QSCI serves as a promising method to take advantage of current noisy quantum devices and pushes forward its application to quantum chemistry. |
| title | ADAPT-QSCI: Adaptive Construction of an Input State for Quantum-Selected Configuration Interaction |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2311.01105 |