Full-field mapping of spatially varying polarization entanglement generated from spontaneous parametric down-conversion
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arXiv
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| Format: | Preprint |
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2025
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| author | Li, Cheng Kulkarni, Girish Soward, Isaac Zhang, Yingwen Upham, Jeremy England, Duncan Nomerotski, Andrei Karimi, Ebrahim Boyd, Robert |
| author_facet | Li, Cheng Kulkarni, Girish Soward, Isaac Zhang, Yingwen Upham, Jeremy England, Duncan Nomerotski, Andrei Karimi, Ebrahim Boyd, Robert |
| contents | Two-photon states generated from spontaneous parametric down-conversion (SPDC) can display entanglement in all degrees of freedom (DoFs) of light, including spatial, temporal, and polarization. The coupling between different DoFs of a two-photon state has been shown to display rich structures that enable novel and robust information processing schemes. While existing literature has studied these couplings by post-selecting the SPDC field, a comprehensive understanding of the inherent spatial-polarization coupling produced in the SPDC process is still lacking. This work produces a full spatial map of the polarization entanglement generated across the entire SPDC field. We observe an entire class of near-maximally polarization-entangled states with an average concurrence of $0.8303\pm0.0004$, which, together with a certified spatial dimensionality of 148, could potentially offer access to a 251-dimensional hyperentanglement. The spatial-polarization coupling manifests as radially or linearly varying polarization-entangled states, whose wavefunctions are dependent on the transverse momenta of the down-converted photons and the pump beam, respectively. Our study lays important groundwork for further exploiting the coupling between entanglement in different DoFs for future quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_03586 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Full-field mapping of spatially varying polarization entanglement generated from spontaneous parametric down-conversion Li, Cheng Kulkarni, Girish Soward, Isaac Zhang, Yingwen Upham, Jeremy England, Duncan Nomerotski, Andrei Karimi, Ebrahim Boyd, Robert Quantum Physics Optics Two-photon states generated from spontaneous parametric down-conversion (SPDC) can display entanglement in all degrees of freedom (DoFs) of light, including spatial, temporal, and polarization. The coupling between different DoFs of a two-photon state has been shown to display rich structures that enable novel and robust information processing schemes. While existing literature has studied these couplings by post-selecting the SPDC field, a comprehensive understanding of the inherent spatial-polarization coupling produced in the SPDC process is still lacking. This work produces a full spatial map of the polarization entanglement generated across the entire SPDC field. We observe an entire class of near-maximally polarization-entangled states with an average concurrence of $0.8303\pm0.0004$, which, together with a certified spatial dimensionality of 148, could potentially offer access to a 251-dimensional hyperentanglement. The spatial-polarization coupling manifests as radially or linearly varying polarization-entangled states, whose wavefunctions are dependent on the transverse momenta of the down-converted photons and the pump beam, respectively. Our study lays important groundwork for further exploiting the coupling between entanglement in different DoFs for future quantum technologies. |
| title | Full-field mapping of spatially varying polarization entanglement generated from spontaneous parametric down-conversion |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2502.03586 |