End-to-End Efficient Quantum Thermal and Ground State Preparation Made Simple
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915683036561408 |
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| author | Ding, Zhiyan Zhan, Yongtao Preskill, John Lin, Lin |
| author_facet | Ding, Zhiyan Zhan, Yongtao Preskill, John Lin, Lin |
| contents | We propose new quantum algorithms for thermal and ground state preparation based on system-bath interactions. These algorithms require only forward evolution under a system-bath Hamiltonian in which the bath is a single reusable ancilla qubit, making them especially well-suited for early fault-tolerant quantum devices. By carefully designing the bath and interaction Hamiltonians, we prove that the fixed point of the dynamics accurately approximates the desired quantum state. Furthermore, we establish theoretical guarantees on the mixing time, and thereby providing a rigorous justification for the end-to-end efficiency of system-bath interaction models in thermal and ground state preparation, for several physically relevant systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05703 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | End-to-End Efficient Quantum Thermal and Ground State Preparation Made Simple Ding, Zhiyan Zhan, Yongtao Preskill, John Lin, Lin Quantum Physics We propose new quantum algorithms for thermal and ground state preparation based on system-bath interactions. These algorithms require only forward evolution under a system-bath Hamiltonian in which the bath is a single reusable ancilla qubit, making them especially well-suited for early fault-tolerant quantum devices. By carefully designing the bath and interaction Hamiltonians, we prove that the fixed point of the dynamics accurately approximates the desired quantum state. Furthermore, we establish theoretical guarantees on the mixing time, and thereby providing a rigorous justification for the end-to-end efficiency of system-bath interaction models in thermal and ground state preparation, for several physically relevant systems. |
| title | End-to-End Efficient Quantum Thermal and Ground State Preparation Made Simple |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2508.05703 |