Cooperative squeezing of internal and collective spins in an atomic ensemble
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909904565960704 |
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| author | Zhang, Youwei Jin, Shenchao Duan, Junlei Mølmer, Klaus Zhang, Guiying Wang, Mingfeng Xiao, Yanhong |
| author_facet | Zhang, Youwei Jin, Shenchao Duan, Junlei Mølmer, Klaus Zhang, Guiying Wang, Mingfeng Xiao, Yanhong |
| contents | Creating highly spin-squeezed states for quantum metrology surpassing the standard quantum limit is a topic of great interest. Spin squeezing has been achieved by either entangling different atoms in an ensemble, or by controlling the multilevel internal spin state of an atom. Here, we experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with $\sim 10^{11}$ rubidium atoms. By synergistically combining these two types of squeezing and carefully aligning their squeezing quadratures, we have achieved a metrologically relevant spin squeezing of $-6.21\pm0.84$ dB, significantly outperforming the results obtained by utilizing either type of squeezing alone. Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_05446 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cooperative squeezing of internal and collective spins in an atomic ensemble Zhang, Youwei Jin, Shenchao Duan, Junlei Mølmer, Klaus Zhang, Guiying Wang, Mingfeng Xiao, Yanhong Quantum Physics Creating highly spin-squeezed states for quantum metrology surpassing the standard quantum limit is a topic of great interest. Spin squeezing has been achieved by either entangling different atoms in an ensemble, or by controlling the multilevel internal spin state of an atom. Here, we experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with $\sim 10^{11}$ rubidium atoms. By synergistically combining these two types of squeezing and carefully aligning their squeezing quadratures, we have achieved a metrologically relevant spin squeezing of $-6.21\pm0.84$ dB, significantly outperforming the results obtained by utilizing either type of squeezing alone. Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble. |
| title | Cooperative squeezing of internal and collective spins in an atomic ensemble |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.05446 |