Enhanced estimation of quantum properties with common randomized measurements
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866911827737182208 |
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| author | Vermersch, Benoît Rath, Aniket Sundar, Bharathan Branciard, Cyril Preskill, John Elben, Andreas |
| author_facet | Vermersch, Benoît Rath, Aniket Sundar, Bharathan Branciard, Cyril Preskill, John Elben, Andreas |
| contents | We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about the quantum state of interest. This method involves performing randomized measurements on a quantum processor and comparing the results with those obtained from a classical computer that stores an approximation of the quantum state. We provide unbiased estimators for expectation values of multi-copy observables and present performance guarantees in terms of variance bounds which depend on the prior knowledge accuracy. We demonstrate the effectiveness of our approach through numerical experiments estimating polynomial approximations of the von Neumann entropy and quantum state fidelities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_12292 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Enhanced estimation of quantum properties with common randomized measurements Vermersch, Benoît Rath, Aniket Sundar, Bharathan Branciard, Cyril Preskill, John Elben, Andreas Quantum Physics We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about the quantum state of interest. This method involves performing randomized measurements on a quantum processor and comparing the results with those obtained from a classical computer that stores an approximation of the quantum state. We provide unbiased estimators for expectation values of multi-copy observables and present performance guarantees in terms of variance bounds which depend on the prior knowledge accuracy. We demonstrate the effectiveness of our approach through numerical experiments estimating polynomial approximations of the von Neumann entropy and quantum state fidelities. |
| title | Enhanced estimation of quantum properties with common randomized measurements |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2304.12292 |