Wideband covariance magnetometry below the diffraction limit
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arXiv
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| Format: | Preprint |
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2025
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| author | Le, Xuan Hoang Dolgirev, Pavel E. Put, Piotr Peterson, Eric L. Pillai, Arjun Zibrov, Alexander A. Demler, Eugene Park, Hongkun Lukin, Mikhail D. |
| author_facet | Le, Xuan Hoang Dolgirev, Pavel E. Put, Piotr Peterson, Eric L. Pillai, Arjun Zibrov, Alexander A. Demler, Eugene Park, Hongkun Lukin, Mikhail D. |
| contents | We experimentally demonstrate a method for measuring correlations of wideband magnetic signals with spatial resolution below the optical diffraction limit. Our technique employs two nitrogen-vacancy (NV) centers in diamond as nanoscale magnetometers, spectrally resolved by inhomogeneous optical transitions. Using high-fidelity optical readout and long spin coherence time, we probe correlated MHz-range noise with sensitivity of 15 nT Hz$^{-1/4}$. In addition, we use this system for correlated $T_1$ relaxometry, enabling correlation measurements of GHz-range noise. Under such externally applied noise, while individual NV centers exhibit featureless relaxation, their correlation displays rich coherent and incoherent dynamics reminiscent of superradiance physics. This capability to probe high-frequency correlations provides a powerful tool for investigating a variety of condensed-matter phenomena characterized by nonlocal correlations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00260 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Wideband covariance magnetometry below the diffraction limit Le, Xuan Hoang Dolgirev, Pavel E. Put, Piotr Peterson, Eric L. Pillai, Arjun Zibrov, Alexander A. Demler, Eugene Park, Hongkun Lukin, Mikhail D. Quantum Physics Mesoscale and Nanoscale Physics Materials Science We experimentally demonstrate a method for measuring correlations of wideband magnetic signals with spatial resolution below the optical diffraction limit. Our technique employs two nitrogen-vacancy (NV) centers in diamond as nanoscale magnetometers, spectrally resolved by inhomogeneous optical transitions. Using high-fidelity optical readout and long spin coherence time, we probe correlated MHz-range noise with sensitivity of 15 nT Hz$^{-1/4}$. In addition, we use this system for correlated $T_1$ relaxometry, enabling correlation measurements of GHz-range noise. Under such externally applied noise, while individual NV centers exhibit featureless relaxation, their correlation displays rich coherent and incoherent dynamics reminiscent of superradiance physics. This capability to probe high-frequency correlations provides a powerful tool for investigating a variety of condensed-matter phenomena characterized by nonlocal correlations. |
| title | Wideband covariance magnetometry below the diffraction limit |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2505.00260 |