Integrated time-bin entangled quantum light source on a 4H-SiC microring chip
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Zeng, Hong Yang, Bing-Cheng Fan, Yun-Ru Zhou, Li-Ping Wang, Cheng-Li Chen, Bo-Wen Yi, Ai-Lun Geng, Yong Deng, Guang-Wei Wang, You Song, Hai-Zhi Zhang, Jun-Tao Li, Hao You, Li-Xing Zhan, Zi-Hao Guo, Kai Ou, Xin Guo, Guang-Can Zhou, Qiang |
| author_facet | Zeng, Hong Yang, Bing-Cheng Fan, Yun-Ru Zhou, Li-Ping Wang, Cheng-Li Chen, Bo-Wen Yi, Ai-Lun Geng, Yong Deng, Guang-Wei Wang, You Song, Hai-Zhi Zhang, Jun-Tao Li, Hao You, Li-Xing Zhan, Zi-Hao Guo, Kai Ou, Xin Guo, Guang-Can Zhou, Qiang |
| contents | Integrated time-bin-entangled photon-pair source with cavity-enhanced nonlinear optical processes is essential for quantum information technologies. However, microcavities with a high quality factor inherently introduce a trade-off between generation efficiency and photon bandwidth, which hinders the development of high-speed quantum networks with an integrated source. Here, we address this challenge by optimizing the nonlinearity property of the material and the geometry of the integrated microring resonator with a 4H-silicon carbide platform. Operating at a loaded quality factor of 1.9 $\times$ 10^5 - spectral bandwidth of 1.0 GHz and pumped with 300-ps double pulses separated by 1.25 ns at a repetition rate of 160 MHz, the device achieves a time-bin-entangled photon-pair generation rate of 1.35 $\times$ 10^7 s^-1 mW^-2. A raw visibility of 95.55 $\pm$ 0.18% is measured, showing a violation of Bell's inequality by more than 138 standard deviations, and a fidelity of 94.37 $\pm$ 0.22% is obtained by quantum state tomography. These results provide a scalable pathway to an efficient and broadband time-bin entangled quantum light source, overcoming intrinsic limitations of cavity-based designs and advancing integrated platforms for future quantum communication networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18124 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Integrated time-bin entangled quantum light source on a 4H-SiC microring chip Zeng, Hong Yang, Bing-Cheng Fan, Yun-Ru Zhou, Li-Ping Wang, Cheng-Li Chen, Bo-Wen Yi, Ai-Lun Geng, Yong Deng, Guang-Wei Wang, You Song, Hai-Zhi Zhang, Jun-Tao Li, Hao You, Li-Xing Zhan, Zi-Hao Guo, Kai Ou, Xin Guo, Guang-Can Zhou, Qiang Quantum Physics Integrated time-bin-entangled photon-pair source with cavity-enhanced nonlinear optical processes is essential for quantum information technologies. However, microcavities with a high quality factor inherently introduce a trade-off between generation efficiency and photon bandwidth, which hinders the development of high-speed quantum networks with an integrated source. Here, we address this challenge by optimizing the nonlinearity property of the material and the geometry of the integrated microring resonator with a 4H-silicon carbide platform. Operating at a loaded quality factor of 1.9 $\times$ 10^5 - spectral bandwidth of 1.0 GHz and pumped with 300-ps double pulses separated by 1.25 ns at a repetition rate of 160 MHz, the device achieves a time-bin-entangled photon-pair generation rate of 1.35 $\times$ 10^7 s^-1 mW^-2. A raw visibility of 95.55 $\pm$ 0.18% is measured, showing a violation of Bell's inequality by more than 138 standard deviations, and a fidelity of 94.37 $\pm$ 0.22% is obtained by quantum state tomography. These results provide a scalable pathway to an efficient and broadband time-bin entangled quantum light source, overcoming intrinsic limitations of cavity-based designs and advancing integrated platforms for future quantum communication networks. |
| title | Integrated time-bin entangled quantum light source on a 4H-SiC microring chip |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.18124 |