量子コンピュータを用いた高精度原子核構造計算の実現-核物理シミュレーションの新たな時代へ-

2026-02-20 宇都宮大学

図 1. ²²O 同位体の基底状態推定に用いた状態作成回路の模式図
(a) 近接量子ビット間の演算に限定した回路 (b) 全結合量子ビットを仮定した回路

＜関連情報＞

• https://www.utsunomiya-u.ac.jp/topics/research/013552.php
• https://www.utsunomiya-u.ac.jp/docs/20260220yoshida.pdf
• https://journals.aps.org/prresearch/abstract/10.1103/td9s-z7my

量子コンピューティングと原子核構造の橋渡し：トラップイオン量子コンピュータ上の原子核 Bridging quantum computing and nuclear structure: Atomic nuclei on a trapped-ion quantum computer

Sota Yoshida,Takeshi Sato,Takumi Ogata,Masaaki Kimura
Physical Review Research  Published: 6 February, 2026
DOI: https://doi.org/10.1103/td9s-z7my

Abstract

We demonstrate quantum simulations of strongly correlated nuclear many-body systems on the RIKEN-Quantinuum Reimei trapped-ion quantum computer, targeting ground states of oxygen, calcium, and nickel isotopes. By combining a hard-core-boson representation of the nuclear shell model with a pair-unitary coupled-cluster doubles ansatz, we achieve subpercent relative error in the ground-state energies compared to noise-free state vector simulations. Our approach leverages symmetry-aware state preparation and particle-number postselection to efficiently capture pairing correlations characteristic of systems with same-species nucleons. These findings highlight the viability of high-fidelity trapped-ion platforms for nuclear physics applications and provide a foundation for scaling to more complex nuclear systems.