Related papers: Experimental Twin-Field Quantum Key Distribution Over 1000 km Fiber Distance

Experimental Twin-Field Quantum Key Distribution Over 1000 km Fiber Distance

URL: http://arxiv.org/abs/2303.15795v1
Date: Tue, 28 Mar 2023 07:59:59 GMT
Title: Experimental Twin-Field Quantum Key Distribution Over 1000 km Fiber Distance
Authors: Yang Liu, Wei-Jun Zhang, Cong Jiang, Jiu-Peng Chen, Chi Zhang, Wen-Xin Pan, Di Ma, Hao Dong, Jia-Min Xiong, Cheng-Jun Zhang, Hao Li, Rui-Chun Wang, Jun Wu, Teng-Yun Chen, Lixing You, Xiang-Bin Wang, Qiang Zhang, and Jian-Wei Pan
Abstract summary: Quantum key distribution (QKD) aims to generate secure private keys shared by two remote parties. We demonstrate a fiber-based twin-field QKD over 1002 km. The secure key rate is $9.53times10-12$ per pulse through 1002 km fiber in the regime, and $8.75times10-12$ per pulse at 952 km considering the finite size effect.
Score: 19.003857958984558
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum key distribution (QKD) aims to generate secure private keys shared by two remote parties. With its security being protected by principles of quantum mechanics, some technology challenges remain towards practical application of QKD. The major one is the distance limit, which is caused by the fact that a quantum signal cannot be amplified while the channel loss is exponential with the distance for photon transmission in optical fiber. Here using the 3-intensity sending-or-not-sending protocol with the actively-odd-parity-pairing method, we demonstrate a fiber-based twin-field QKD over 1002 km. In our experiment, we developed a dual-band phase estimation and ultra-low noise superconducting nanowire single-photon detectors to suppress the system noise to around 0.02 Hz. The secure key rate is $9.53\times10^{-12}$ per pulse through 1002 km fiber in the asymptotic regime, and $8.75\times10^{-12}$ per pulse at 952 km considering the finite size effect. Our work constitutes a critical step towards the future large-scale quantum network.

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