Variational quantum state preparation for quantum-enhanced metrology in noisy systems
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866908347953840128 |
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| author | Castro, Juan C. Zuñiga Larson, Jeffrey Narayanan, Sri Hari Krishna Colussi, Victor E. Perlin, Michael A. Lewis-Swan, Robert J. |
| author_facet | Castro, Juan C. Zuñiga Larson, Jeffrey Narayanan, Sri Hari Krishna Colussi, Victor E. Perlin, Michael A. Lewis-Swan, Robert J. |
| contents | We investigate optimized quantum state preparation for quantum metrology applications in noisy environments. Using the QFI-Opt package, we simulate a low-depth variational quantum circuit (VQC) composed of a sequence of global rotations and entangling operations applied to a chain of qubits that are subject to dephasing noise. The parameters controlling the VQC are numerically optimized to maximize the quantum Fisher information, which characterizes the ultimate metrological sensitivity of a quantum state with respect to a global rotation. We find that regardless of the details of the entangling operation implemented in the VQC, the optimal quantum states can be broadly classified into a trio of qualitative regimes--cat-like, squeezed-like, and product states--associated with different dephasing rates. Our findings are relevant for designing optimal state-preparation strategies for next-generation quantum sensors exploiting entanglement, such as time and frequency standards and magnetometers, aimed at achieving state-of-the-art performance in the presence of noise and decoherence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_01859 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Variational quantum state preparation for quantum-enhanced metrology in noisy systems Castro, Juan C. Zuñiga Larson, Jeffrey Narayanan, Sri Hari Krishna Colussi, Victor E. Perlin, Michael A. Lewis-Swan, Robert J. Quantum Physics We investigate optimized quantum state preparation for quantum metrology applications in noisy environments. Using the QFI-Opt package, we simulate a low-depth variational quantum circuit (VQC) composed of a sequence of global rotations and entangling operations applied to a chain of qubits that are subject to dephasing noise. The parameters controlling the VQC are numerically optimized to maximize the quantum Fisher information, which characterizes the ultimate metrological sensitivity of a quantum state with respect to a global rotation. We find that regardless of the details of the entangling operation implemented in the VQC, the optimal quantum states can be broadly classified into a trio of qualitative regimes--cat-like, squeezed-like, and product states--associated with different dephasing rates. Our findings are relevant for designing optimal state-preparation strategies for next-generation quantum sensors exploiting entanglement, such as time and frequency standards and magnetometers, aimed at achieving state-of-the-art performance in the presence of noise and decoherence. |
| title | Variational quantum state preparation for quantum-enhanced metrology in noisy systems |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.01859 |