Approximating many-body quantum states with quantum circuits and measurements
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866915046280396800 |
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| author | Piroli, Lorenzo Styliaris, Georgios Cirac, J. Ignacio |
| author_facet | Piroli, Lorenzo Styliaris, Georgios Cirac, J. Ignacio |
| contents | We introduce protocols to prepare many-body quantum states with quantum circuits assisted by local operations and classical communication. We show that by lifting the requirement of exact preparation, one can substantially save resources. In particular, the so-called $W$ and, more generally, Dicke states require a circuit depth and number of ancillas per site that are independent of the system size. As a byproduct of our work, we introduce an efficient scheme to implement certain non-local, non-Clifford unitary operators. We also discuss how similar ideas may be applied in the preparation of eigenstates of well-known spin models, both free and interacting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_07604 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Approximating many-body quantum states with quantum circuits and measurements Piroli, Lorenzo Styliaris, Georgios Cirac, J. Ignacio Quantum Physics Statistical Mechanics We introduce protocols to prepare many-body quantum states with quantum circuits assisted by local operations and classical communication. We show that by lifting the requirement of exact preparation, one can substantially save resources. In particular, the so-called $W$ and, more generally, Dicke states require a circuit depth and number of ancillas per site that are independent of the system size. As a byproduct of our work, we introduce an efficient scheme to implement certain non-local, non-Clifford unitary operators. We also discuss how similar ideas may be applied in the preparation of eigenstates of well-known spin models, both free and interacting. |
| title | Approximating many-body quantum states with quantum circuits and measurements |
| topic | Quantum Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2403.07604 |