Shallow Electronic State Preparation for Quantum Chemistry with Quantum Monte Carlo Pre-Selection
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | |
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| _version_ | 1866914616482725888 |
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| author | Welling, Eline Cadi-Tazi, Lila Thom, Alex J. W. Filip, Maria-Andreea |
| author_facet | Welling, Eline Cadi-Tazi, Lila Thom, Alex J. W. Filip, Maria-Andreea |
| contents | Quantum computers hold great promise for molecular simulation, but noise remains a fundamental obstacle. We introduce a Quantum Monte Carlo (QMC) pre-screening procedure that constructs compact, physically motivated Givens rotation ansätze tailored to realistic quantum hardware. By identifying the most important wavefunction contributions early in a QMC simulation, we build circuits that are shallower that conventional alternatives while preserving number symmetry. Benchmarked on Quantinuum System Model H1, QMC-prescreened circuits outperform more complex ansätze under realistic noise conditions. The method offers a practical path toward chemical accuracy on quantum devices, by providing an adjustable trade-off between expressivity and circuit depth to generate shallow circuits suited to current high-noise devices, as well as deeper, more expressive circuits that can be deployed on future lower-noise devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_31139 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Shallow Electronic State Preparation for Quantum Chemistry with Quantum Monte Carlo Pre-Selection Welling, Eline Cadi-Tazi, Lila Thom, Alex J. W. Filip, Maria-Andreea Quantum Physics Chemical Physics Quantum computers hold great promise for molecular simulation, but noise remains a fundamental obstacle. We introduce a Quantum Monte Carlo (QMC) pre-screening procedure that constructs compact, physically motivated Givens rotation ansätze tailored to realistic quantum hardware. By identifying the most important wavefunction contributions early in a QMC simulation, we build circuits that are shallower that conventional alternatives while preserving number symmetry. Benchmarked on Quantinuum System Model H1, QMC-prescreened circuits outperform more complex ansätze under realistic noise conditions. The method offers a practical path toward chemical accuracy on quantum devices, by providing an adjustable trade-off between expressivity and circuit depth to generate shallow circuits suited to current high-noise devices, as well as deeper, more expressive circuits that can be deployed on future lower-noise devices. |
| title | Shallow Electronic State Preparation for Quantum Chemistry with Quantum Monte Carlo Pre-Selection |
| topic | Quantum Physics Chemical Physics |
| url | https://arxiv.org/abs/2605.31139 |