Violation of local realism with spatially multimode parametric down-conversion pumped by spatially incoherent light
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866918220516032512 |
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| author | Li, Cheng Upham, Jeremy Braverman, Boris Boyd, Robert W. |
| author_facet | Li, Cheng Upham, Jeremy Braverman, Boris Boyd, Robert W. |
| contents | We experimentally demonstrate a violation of local realism with highly spatially multimode polarization-entangled two-photon states produced by spontaneous parametric down-conversion (SPDC) pumped by a spatially incoherent light source-a light-emitting diode (LED). While existing studies have observed such a violation only by post-selecting the LED-pumped SPDC photons into a single spatial detection mode, we achieve a Clauser-Horne-Shimony-Holt inequality violation of $S = 2.532 \pm 0.069 > 2$ using a spatially multimode detection setup that collects nearly 4,080 SPDC spatial modes. These results indicate that coherent pump sources, such as lasers, are not required for SPDC-based entanglement generation. Our work could enable novel and practical sources of entangled photons for quantum technologies such as device-independent quantum key distribution and quantum-enhanced sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_05106 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Violation of local realism with spatially multimode parametric down-conversion pumped by spatially incoherent light Li, Cheng Upham, Jeremy Braverman, Boris Boyd, Robert W. Quantum Physics Optics We experimentally demonstrate a violation of local realism with highly spatially multimode polarization-entangled two-photon states produced by spontaneous parametric down-conversion (SPDC) pumped by a spatially incoherent light source-a light-emitting diode (LED). While existing studies have observed such a violation only by post-selecting the LED-pumped SPDC photons into a single spatial detection mode, we achieve a Clauser-Horne-Shimony-Holt inequality violation of $S = 2.532 \pm 0.069 > 2$ using a spatially multimode detection setup that collects nearly 4,080 SPDC spatial modes. These results indicate that coherent pump sources, such as lasers, are not required for SPDC-based entanglement generation. Our work could enable novel and practical sources of entangled photons for quantum technologies such as device-independent quantum key distribution and quantum-enhanced sensing. |
| title | Violation of local realism with spatially multimode parametric down-conversion pumped by spatially incoherent light |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2507.05106 |