Tracking time-varying signals with quantum-enhanced atomic magnetometers
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915585736048640 |
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| author | Amoros-Binefa, Julia Mitchell, Morgan W. Kolodynski, Jan |
| author_facet | Amoros-Binefa, Julia Mitchell, Morgan W. Kolodynski, Jan |
| contents | Quantum entanglement, in the form of spin squeezing, is known to improve the sensitivity of atomic instruments to static or slowly-varying quantities. Sensing transient events presents a distinct challenge, requires different analysis methods, and has not been shown to benefit from entanglement in practically-important scenarios such as spin-precession magnetometry (SPM). Here we adapt estimation control techniques introduced in [PRX Quantum 6, 030331 (2025)] to the experimental setting of SPM and analogous techniques. We demonstrate that real-time tracking of fluctuating fields benefits from measurement-induced spin squeezing and that quantum limits dictated by decoherence are within reach of today's experiments. We illustrate this quantum advantage by single-shot tracking, within the coherence time of a spin-precession magnetometer, of a magnetocardiography signal overlain with broadband noise. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14793 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tracking time-varying signals with quantum-enhanced atomic magnetometers Amoros-Binefa, Julia Mitchell, Morgan W. Kolodynski, Jan Quantum Physics Quantum entanglement, in the form of spin squeezing, is known to improve the sensitivity of atomic instruments to static or slowly-varying quantities. Sensing transient events presents a distinct challenge, requires different analysis methods, and has not been shown to benefit from entanglement in practically-important scenarios such as spin-precession magnetometry (SPM). Here we adapt estimation control techniques introduced in [PRX Quantum 6, 030331 (2025)] to the experimental setting of SPM and analogous techniques. We demonstrate that real-time tracking of fluctuating fields benefits from measurement-induced spin squeezing and that quantum limits dictated by decoherence are within reach of today's experiments. We illustrate this quantum advantage by single-shot tracking, within the coherence time of a spin-precession magnetometer, of a magnetocardiography signal overlain with broadband noise. |
| title | Tracking time-varying signals with quantum-enhanced atomic magnetometers |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.14793 |