Structured-Light Magnetometry in a Coherently Controlled Atomic Medium
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908930059272192 |
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| author | Bhardwaj, Parkhi Dasgupta, Shubhrangshu |
| author_facet | Bhardwaj, Parkhi Dasgupta, Shubhrangshu |
| contents | A structured-light-based approach for detecting magneto-optical rotation is presented, in which polarization rotation is mapped onto a directly observable spatial degree of freedom. A radially polarized Laguerre-Gaussian beam interacts with cold $^{87}\mathrm{Rb}$ atoms in the presence of a longitudinal magnetic field, where magnetically induced circular birefringence introduces a relative phase shift between the $σ_+$ and $σ_-$ components of the field, manifesting as a rotation of the interference pattern. The MOR angle is extracted directly from the angular displacement of the petal-shaped intensity distribution, eliminating the need for polarizers or Stokes-parameter analysis. This method converts conventional polarization-based magnetometry into a topology-based spatial readout, enabling spatially resolved magnetic-field sensing with potential applications in optical magnetometry and quantum sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_25781 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Structured-Light Magnetometry in a Coherently Controlled Atomic Medium Bhardwaj, Parkhi Dasgupta, Shubhrangshu Atomic Physics Quantum Physics A structured-light-based approach for detecting magneto-optical rotation is presented, in which polarization rotation is mapped onto a directly observable spatial degree of freedom. A radially polarized Laguerre-Gaussian beam interacts with cold $^{87}\mathrm{Rb}$ atoms in the presence of a longitudinal magnetic field, where magnetically induced circular birefringence introduces a relative phase shift between the $σ_+$ and $σ_-$ components of the field, manifesting as a rotation of the interference pattern. The MOR angle is extracted directly from the angular displacement of the petal-shaped intensity distribution, eliminating the need for polarizers or Stokes-parameter analysis. This method converts conventional polarization-based magnetometry into a topology-based spatial readout, enabling spatially resolved magnetic-field sensing with potential applications in optical magnetometry and quantum sensing. |
| title | Structured-Light Magnetometry in a Coherently Controlled Atomic Medium |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2603.25781 |