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| Hauptverfasser: | , , , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2511.22825 |
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| _version_ | 1866915643077427200 |
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| author | Yasui, Shoichiro Inaba, Tomohiro Nishi, Hidetaka Kaji, Reina Adachi, Satoru Xu, Xuejun Sanada, Haruki |
| author_facet | Yasui, Shoichiro Inaba, Tomohiro Nishi, Hidetaka Kaji, Reina Adachi, Satoru Xu, Xuejun Sanada, Haruki |
| contents | Entangled photon-pair sources are indispensable building blocks of quantum information processing technologies. Among the available approaches, on-chip microresonators are particularly promising owing to their resonant enhancement, CMOS-compatible fabrication, and wafer-scale integration capabilities. In this study, we optimized the structure of silicon microring resonators to suppress sidewall scattering. As a result, we achieved an intrinsic Q-factor of 1.26$\times$10$^6$ using only standard fabrication processes. The high-Q resonator enabled a brightness coefficient of 3.9$\times$10$^9$ Hz/GHz/mW$^2$, with a maximum brightness of 22.0 MHz/GHz and a maximum photon-pair generation rate of 9.19 MHz. Furthermore, Franson-type two-photon interference exhibited a visibility of 98.0$\pm$0.2%, confirming time-energy entanglement. These results show that narrow bandwidth and high generation rate can be achieved simultaneously in CMOS-compatible silicon photonic sources, advancing their use in quantum repeaters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_22825 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Narrowband and high-rate entangled photon-pair generation from a high-Q silicon microring resonator Yasui, Shoichiro Inaba, Tomohiro Nishi, Hidetaka Kaji, Reina Adachi, Satoru Xu, Xuejun Sanada, Haruki Optics Entangled photon-pair sources are indispensable building blocks of quantum information processing technologies. Among the available approaches, on-chip microresonators are particularly promising owing to their resonant enhancement, CMOS-compatible fabrication, and wafer-scale integration capabilities. In this study, we optimized the structure of silicon microring resonators to suppress sidewall scattering. As a result, we achieved an intrinsic Q-factor of 1.26$\times$10$^6$ using only standard fabrication processes. The high-Q resonator enabled a brightness coefficient of 3.9$\times$10$^9$ Hz/GHz/mW$^2$, with a maximum brightness of 22.0 MHz/GHz and a maximum photon-pair generation rate of 9.19 MHz. Furthermore, Franson-type two-photon interference exhibited a visibility of 98.0$\pm$0.2%, confirming time-energy entanglement. These results show that narrow bandwidth and high generation rate can be achieved simultaneously in CMOS-compatible silicon photonic sources, advancing their use in quantum repeaters. |
| title | Narrowband and high-rate entangled photon-pair generation from a high-Q silicon microring resonator |
| topic | Optics |
| url | https://arxiv.org/abs/2511.22825 |