Ultrabright Entanglement Based Quantum Key Distribution over a 404 km Optical Fiber
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911005697638400 |
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| author | Zhuang, Shi-Chang Li, Bo Zheng, Ming-Yang Zeng, Yi-Xi Wu, Hui-Nan Li, Guang-Bing Yao, Quan Xie, Xiu-Ping Li, Yu-Huai Qin, Hao You, Li-Xing Xu, Feihu Yin, Juan Cao, Yuan Zhang, Qiang Peng, Cheng-Zhi Pan, Jian-Wei |
| author_facet | Zhuang, Shi-Chang Li, Bo Zheng, Ming-Yang Zeng, Yi-Xi Wu, Hui-Nan Li, Guang-Bing Yao, Quan Xie, Xiu-Ping Li, Yu-Huai Qin, Hao You, Li-Xing Xu, Feihu Yin, Juan Cao, Yuan Zhang, Qiang Peng, Cheng-Zhi Pan, Jian-Wei |
| contents | Entangled photons are crucial resources for quantum information processing. Here, we present an ultrabright polarization-entangled photon source based on a periodically poled lithium niobate waveguide designed for practical quantum communication networks. Using a 780 nm pump laser, the source achieves a pair generation rate of 2.4 $\times 10^{10}$ pairs/s/mW. Remarkably, the entangled photons are bright enough to be detected by a power meter, reaching a power of 17.9 nW under a pump power of 3.2 mW. We demonstrate the practicality of the source by conducting quantum key distribution experiments over long-distance fiber links. Wavelength-division multiplexing was employed to enhance the key generation, and nonlocal dispersion compensation was implemented to ensure precise timing coincidence measurements across a broad spectral range. By utilizing nine pairs of wavelength channels, the system achieved the applicable secure key rates of up to 440.80 bits/s over 200 km with a 62 dB loss and extended the maximum secure key generation distance to 404 km. These results demonstrate the potential of wavelength-multiplexed polarization-entangled photon sources for high-speed, long-distance quantum communication, positioning them as key components for future large-scale quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04361 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrabright Entanglement Based Quantum Key Distribution over a 404 km Optical Fiber Zhuang, Shi-Chang Li, Bo Zheng, Ming-Yang Zeng, Yi-Xi Wu, Hui-Nan Li, Guang-Bing Yao, Quan Xie, Xiu-Ping Li, Yu-Huai Qin, Hao You, Li-Xing Xu, Feihu Yin, Juan Cao, Yuan Zhang, Qiang Peng, Cheng-Zhi Pan, Jian-Wei Quantum Physics Entangled photons are crucial resources for quantum information processing. Here, we present an ultrabright polarization-entangled photon source based on a periodically poled lithium niobate waveguide designed for practical quantum communication networks. Using a 780 nm pump laser, the source achieves a pair generation rate of 2.4 $\times 10^{10}$ pairs/s/mW. Remarkably, the entangled photons are bright enough to be detected by a power meter, reaching a power of 17.9 nW under a pump power of 3.2 mW. We demonstrate the practicality of the source by conducting quantum key distribution experiments over long-distance fiber links. Wavelength-division multiplexing was employed to enhance the key generation, and nonlocal dispersion compensation was implemented to ensure precise timing coincidence measurements across a broad spectral range. By utilizing nine pairs of wavelength channels, the system achieved the applicable secure key rates of up to 440.80 bits/s over 200 km with a 62 dB loss and extended the maximum secure key generation distance to 404 km. These results demonstrate the potential of wavelength-multiplexed polarization-entangled photon sources for high-speed, long-distance quantum communication, positioning them as key components for future large-scale quantum networks. |
| title | Ultrabright Entanglement Based Quantum Key Distribution over a 404 km Optical Fiber |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2408.04361 |