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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.17648 |
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| _version_ | 1866917282975842304 |
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| author | Isogawa, Takuya Hu, Zhiyao Kanamoto, Ayumi Phadetsuwannukun, Nutdech Wang, Shilin Nishimura, Shunsuke Li, Boning Jiang, Liang Saleem, Zain H. Wang, Guoqing Yuan, Haidong Cappellaro, Paola |
| author_facet | Isogawa, Takuya Hu, Zhiyao Kanamoto, Ayumi Phadetsuwannukun, Nutdech Wang, Shilin Nishimura, Shunsuke Li, Boning Jiang, Liang Saleem, Zain H. Wang, Guoqing Yuan, Haidong Cappellaro, Paola |
| contents | Simultaneously estimating multiple parameters at the ultimate limit is a central challenge in quantum metrology, often hindered by inherent incompatibilities in optimal estimation strategies. At its most extreme, this incompatibility culminates in a fundamental impossibility when the quantum Fisher information matrix (QFIM) becomes singular, rendering joint estimation unattainable. This is the case for a canonical problem: estimating the amplitude and frequency of an AC magnetic field, where the generators are parallel to each other. Here, we introduce a quantum control protocol that resolves this singularity. Our control protocol strategically engineers the sensor's time evolution so the generators for the two parameters become orthogonal. It not only removes the singularity but also restores the optimal scaling of precision with interrogation time for both parameters simultaneously. We experimentally validate this protocol using a nitrogen-vacancy center in diamond at room temperature, demonstrating the concurrent achievement of the optimal scaling for both parameters under realistic conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_17648 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Approaching the Limit in Multiparameter AC Magnetometry with Quantum Control Isogawa, Takuya Hu, Zhiyao Kanamoto, Ayumi Phadetsuwannukun, Nutdech Wang, Shilin Nishimura, Shunsuke Li, Boning Jiang, Liang Saleem, Zain H. Wang, Guoqing Yuan, Haidong Cappellaro, Paola Quantum Physics Simultaneously estimating multiple parameters at the ultimate limit is a central challenge in quantum metrology, often hindered by inherent incompatibilities in optimal estimation strategies. At its most extreme, this incompatibility culminates in a fundamental impossibility when the quantum Fisher information matrix (QFIM) becomes singular, rendering joint estimation unattainable. This is the case for a canonical problem: estimating the amplitude and frequency of an AC magnetic field, where the generators are parallel to each other. Here, we introduce a quantum control protocol that resolves this singularity. Our control protocol strategically engineers the sensor's time evolution so the generators for the two parameters become orthogonal. It not only removes the singularity but also restores the optimal scaling of precision with interrogation time for both parameters simultaneously. We experimentally validate this protocol using a nitrogen-vacancy center in diamond at room temperature, demonstrating the concurrent achievement of the optimal scaling for both parameters under realistic conditions. |
| title | Approaching the Limit in Multiparameter AC Magnetometry with Quantum Control |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.17648 |