Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912760071192576 |
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| author | Lin, Chang-Wei Ma, Yi-Ting Shiu, Jiun-Shiuan Chen, Yong-Fan |
| author_facet | Lin, Chang-Wei Ma, Yi-Ting Shiu, Jiun-Shiuan Chen, Yong-Fan |
| contents | We demonstrate polarization-entangled biphotons in a cold-atom double-$Λ$ system, overcoming atomic selection rules that suppress polarization correlations and favor orbital angular momentum (OAM) entanglement. Using spatial light modulators, we coherently map a selected two-dimensional OAM subspace onto the polarization basis and thereby open an otherwise inaccessible polarization channel. Quantum-state tomography confirms that the mapping preserves the biphoton coherence. The four polarization Bell states are generated with fidelities of $92\text{-}94\%$ with few-percent statistical uncertainties, and an average Clauser-Horne-Shimony-Holt parameter of $S=2.44$ verifies the survival of nonlocal correlations. To the best of our knowledge, this work presents the first demonstration of OAM-to-polarization entanglement transfer in a cold-atom spontaneous four-wave mixing platform and establishes a practical interface for integrating atomic OAM resources with polarization-based quantum communication networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11625 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping Lin, Chang-Wei Ma, Yi-Ting Shiu, Jiun-Shiuan Chen, Yong-Fan Quantum Physics We demonstrate polarization-entangled biphotons in a cold-atom double-$Λ$ system, overcoming atomic selection rules that suppress polarization correlations and favor orbital angular momentum (OAM) entanglement. Using spatial light modulators, we coherently map a selected two-dimensional OAM subspace onto the polarization basis and thereby open an otherwise inaccessible polarization channel. Quantum-state tomography confirms that the mapping preserves the biphoton coherence. The four polarization Bell states are generated with fidelities of $92\text{-}94\%$ with few-percent statistical uncertainties, and an average Clauser-Horne-Shimony-Holt parameter of $S=2.44$ verifies the survival of nonlocal correlations. To the best of our knowledge, this work presents the first demonstration of OAM-to-polarization entanglement transfer in a cold-atom spontaneous four-wave mixing platform and establishes a practical interface for integrating atomic OAM resources with polarization-based quantum communication networks. |
| title | Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.11625 |