Related papers: Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping

Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping

URL: http://arxiv.org/abs/2512.11625v1
Date: Fri, 12 Dec 2025 15:02:31 GMT
Title: Polarization Entanglement in Atomic Biphotons via OAM-to-Spin Mapping
Authors: Chang-Wei Lin, Yi-Ting Ma, Jiun-Shiuan Shiu, Yong-Fan Chen,
Abstract summary: We demonstrate polarization-entangled biphotons in a cold-atom double-$$ system.<n>We map a selected two-dimensional OAM subspace onto the polarization basis and thereby open an otherwise inaccessible polarization channel.<n>This work presents the first demonstration of OAM-to-polarization entanglement transfer in a cold-atom spontaneous four-wave mixing platform.
Score: 1.1666234644810893
License: http://creativecommons.org/licenses/by/4.0/
Abstract: 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.

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