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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2503.24090 |
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| _version_ | 1866908292065787904 |
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| author | Melegari, Dario Razaq, Rabia Abdul Minuto, Giovanni Solinas, Paolo |
| author_facet | Melegari, Dario Razaq, Rabia Abdul Minuto, Giovanni Solinas, Paolo |
| contents | We present a comparative study of two implementations of a variational quantum algorithm aimed at minimizing the energy of a complex quantum system. In one implementation, we extract the information of the energy gradient by projective measurements. In the second implementation, called the Non-Demolition approach, the gradient information is stored in a quantum detector, which is eventually measured. As prototypical examples, we study the energy minimization of the Lithium-based molecules and then extend the analysis systems with increased complexity. We find that, while both approaches are able to identify the energy minimum, the Non-Demolition approach has a clear advantage in terms of the overall computational resources needed. This advantage increases linearly with the complexity of the quantum system, making the Non-Demolition approach the ideal candidate to implement such variational quantum algorithms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_24090 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Resource reduction for variational quantum algorithms by non-demolition measurements Melegari, Dario Razaq, Rabia Abdul Minuto, Giovanni Solinas, Paolo Quantum Physics We present a comparative study of two implementations of a variational quantum algorithm aimed at minimizing the energy of a complex quantum system. In one implementation, we extract the information of the energy gradient by projective measurements. In the second implementation, called the Non-Demolition approach, the gradient information is stored in a quantum detector, which is eventually measured. As prototypical examples, we study the energy minimization of the Lithium-based molecules and then extend the analysis systems with increased complexity. We find that, while both approaches are able to identify the energy minimum, the Non-Demolition approach has a clear advantage in terms of the overall computational resources needed. This advantage increases linearly with the complexity of the quantum system, making the Non-Demolition approach the ideal candidate to implement such variational quantum algorithms. |
| title | Resource reduction for variational quantum algorithms by non-demolition measurements |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.24090 |