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Wang, Shuang; Yin, Zhen-Qiang; He, De-Yong; Chen, Wei; Wang, Rui-Qiang; Ye, Peng; Zhou, Yao; Fan-Yuan, Guan-Jie; Wang, Fang-Xiang; Chen, Wei; Zhu, Yong-Gang; Morozov, Pavel V.; Divochiy, Alexander V.; Zhou, Zheng; Guo, Guang-Can; Han, Zheng-Fu
Nature photonics, 02/2022, Letnik: 16, Številka: 2Journal Article
Quantum key distribution (QKD) provides a promising solution for sharing information-theoretic secure keys between remote peers with physics-based protocols. According to the law of quantum physics, the photons carrying signals cannot be amplified or relayed via classical optical techniques to maintain quantum security. As a result, the transmission loss of the channel limits its achievable distance, and this has been a huge barrier towards building large-scale quantum-secure networks. Here we present an experimental QKD system that could tolerate a channel loss beyond 140 dB and obtain a secure distance of 833.8 km, setting a new record for fibre-based QKD. Furthermore, the optimized four-phase twin-field protocol and high-quality set-up make its secure key rate more than two orders of magnitude greater than previous records over similar distances. Our results mark a breakthrough towards building reliable and efficient terrestrial quantum-secure networks over a scale of 1,000 km.Twin-field (TF) quantum key distribution (QKD) over a secure distance of 833.8 km is demonstrated even in the finite-size regime. To this end, an optimized four-phase TF-QKD protocol and a high-speed low-noise TF-QKD system are developed.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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