Related papers: Ultrabright-entanglement-based quantum key distribution over a 404-km-long optical fiber

Ultrabright-entanglement-based quantum key distribution over a 404-km-long optical fiber

URL: http://arxiv.org/abs/2408.04361v2
Date: Fri, 9 Aug 2024 01:43:04 GMT
Title: Ultrabright-entanglement-based quantum key distribution over a 404-km-long optical fiber
Authors: Shi-Chang Zhuang, Bo Li, Ming-Yang Zheng, Yi-Xi Zeng, Hui-Nan Wu, Guang-Bing Li, Quan Yao, Xiu-Ping Xie, Yu-Huai Li, Hao Qin, Li-Xing You, Fei-Hu Xu, Juan Yin, Yuan Cao, Qiang Zhang, Cheng-Zhi Peng, Jian-Wei Pan,
Abstract summary: This work has achieved a directly measured power of 17.9 nW in entangled photon generation with a 3.2 mW pump power. Results demonstrate the potential of wavelength-multiplexed polarization-entangled photon sources for high-speed, long-distance quantum communication.
Score: 12.197914166060688
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: The entangled photons are crucial resources for quantum communications and networking. Here, we present an ultra-bright 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. This work has achieved a directly measured power of 17.9 nW in entangled photon generation with a 3.2 mW pump power. Based on this, we demonstrate the practicality of the source by conducting quantum key distribution experiments over long-distance fiber links, achieving the applicable secure key rates of up to 440.80 bits/s over 200 km with 62 dB loss and reaching a maximum secure key generation distance of 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.

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