Abstract
The ultimate aim of quantum key distribution (QKD) is improving the transmission distance and key generation speed. Unfortunately, it is believed to be limited by the secret-key capacity of quantum channel without quantum repeater. Recently, a novel twin-field QKD (TF-QKD) is proposed to break through the limit, where the key rate is proportional to the square-root of channel transmittance. Here, by using the vacuum and one-photon state as a qubit, we show that the TF-QKD can be regarded as a measurement-device-independent QKD (MDI-QKD) with single-photon Bell state measurement. Therefore, the MDI property of TF-QKD can be understood clearly. Importantly, the universal security proof theories can be directly used for TF-QKD, such as BB84 encoding, six-state encoding and reference-frame-independent scheme. Furthermore, we propose a feasible experimental scheme for the proof-of-principle experimental demonstration.
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Citations
Oct 19, 2019·Scientific Reports·Hua-Lei Yin, Zeng-Bing Chen
Nov 21, 2019·Scientific Reports·Hua-Lei Yin, Zeng-Bing Chen
Oct 31, 2019·Scientific Reports·Wei LiShengmei Zhao
Oct 2, 2019·Physical Review Letters·Xiaoqing ZhongHoi-Kwong Lo
Jul 19, 2019·Nature Communications·Kento MaedaMasato Koashi
Jul 3, 2021·Entropy·Zhao-Ying JiaZeng-Bing Chen