Dispersive measurement of spin shot noise in a Bose--Einstein condensate
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866929687814471680 |
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| author | Shibata, Kosuke Sekiguchi, Naota Takai, Junnosuke Hirano, Takuya |
| author_facet | Shibata, Kosuke Sekiguchi, Naota Takai, Junnosuke Hirano, Takuya |
| contents | We report dispersive spin shot noise measurement of a Bose--Einstein condensate (BEC). While dispersive probing has been used for quantum spin noise measurement of thermal and cold gases for decades, confirmative measurement of spin shot noise, i.e.,\ the linear dependence of the spin variance on the number of atoms in a BEC has been lacking. Here, we demonstrate precise spin noise measurement of a BEC of rubidium atoms at the spin shot noise level by polarization rotation using a two-color probe at optimal detunings, with power balance stabilization to suppress probe-induced excess spin noise. This work opens the possibility for the unexplored study of quantum spin fluctuations in multi-component or spinor BECs and offers an approach to improve spin measurement precision, which is relevant to atomic spin-based sensors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_15546 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dispersive measurement of spin shot noise in a Bose--Einstein condensate Shibata, Kosuke Sekiguchi, Naota Takai, Junnosuke Hirano, Takuya Quantum Gases Quantum Physics We report dispersive spin shot noise measurement of a Bose--Einstein condensate (BEC). While dispersive probing has been used for quantum spin noise measurement of thermal and cold gases for decades, confirmative measurement of spin shot noise, i.e.,\ the linear dependence of the spin variance on the number of atoms in a BEC has been lacking. Here, we demonstrate precise spin noise measurement of a BEC of rubidium atoms at the spin shot noise level by polarization rotation using a two-color probe at optimal detunings, with power balance stabilization to suppress probe-induced excess spin noise. This work opens the possibility for the unexplored study of quantum spin fluctuations in multi-component or spinor BECs and offers an approach to improve spin measurement precision, which is relevant to atomic spin-based sensors. |
| title | Dispersive measurement of spin shot noise in a Bose--Einstein condensate |
| topic | Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2501.15546 |