Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator
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arXiv
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| Format: | Preprint |
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2025
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| author | Kellner, Jost Sabatti, Alessandra Kuttner, Tristan Chapman, Robert J. Grange, Rachel |
| author_facet | Kellner, Jost Sabatti, Alessandra Kuttner, Tristan Chapman, Robert J. Grange, Rachel |
| contents | Quantum photonic technologies rely on the ability to generate, manipulate, and interfere indistinguishable single photons on a scalable platform. Among the various approaches, spontaneous parametric down-conversion (SPDC) remains one of the most widely used methods for generating entangled or pure photon pairs. However most integrated SPDC sources relying on co-propagating geometries have a limited purity of heralded photons, or require lossy filtering. Type-2 SPDC processes can produce pure separable photons but typically suffer from lower efficiency and added complexity due to polarisation management. Here we show the first integrated counter-propagating photon-pair source on lithium niobate on insulator, where signal and idler photons are generated in opposite directions. The counter-propagating geometry leads to spectrally uncorrelated photon pairs without spectral filtering. The joint spectral intensity measurements and unheralded $g^{(2)}$ correlations, yield purities of (92$\pm$3)%. Interference between two independent sources achieves heralded visibilities of (71$\pm$3)%, confirming the scalability of the platform. These results establish a new route toward integrated, high-purity, and tunable photon sources. The demonstrated counter-propagating geometry offers a scalable solution for quantum photonic networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21396 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator Kellner, Jost Sabatti, Alessandra Kuttner, Tristan Chapman, Robert J. Grange, Rachel Quantum Physics Optics Quantum photonic technologies rely on the ability to generate, manipulate, and interfere indistinguishable single photons on a scalable platform. Among the various approaches, spontaneous parametric down-conversion (SPDC) remains one of the most widely used methods for generating entangled or pure photon pairs. However most integrated SPDC sources relying on co-propagating geometries have a limited purity of heralded photons, or require lossy filtering. Type-2 SPDC processes can produce pure separable photons but typically suffer from lower efficiency and added complexity due to polarisation management. Here we show the first integrated counter-propagating photon-pair source on lithium niobate on insulator, where signal and idler photons are generated in opposite directions. The counter-propagating geometry leads to spectrally uncorrelated photon pairs without spectral filtering. The joint spectral intensity measurements and unheralded $g^{(2)}$ correlations, yield purities of (92$\pm$3)%. Interference between two independent sources achieves heralded visibilities of (71$\pm$3)%, confirming the scalability of the platform. These results establish a new route toward integrated, high-purity, and tunable photon sources. The demonstrated counter-propagating geometry offers a scalable solution for quantum photonic networks. |
| title | Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2506.21396 |