Open AccessPractical issues of twin-field quantum key distribution
Author(s) -
Feng-Yu Lu,
Zhen-Qiang Yin,
Rong Wang,
Guan-Jie Fan-Yuan,
Shuang Wang,
DeYong He,
Wei Chen,
Wei Huang,
Bingjie Xu,
GuangCan Guo,
ZhengFu Han
Publication year - 2019
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/ab5a97
Subject(s) - quantum key distribution , physics , key (lock) , intensity (physics) , matching (statistics) , field (mathematics) , field intensity , statistical physics , key generation , phase (matter) , quantum , quantum mechanics , computer science , algorithm , statistics , computer security , mathematics , nuclear magnetic resonance , cryptography , pure mathematics
Twin-field quantum key distribution(TF-QKD) protocol and its variants, such as phase-matching QKD, sending-or-not-sending QKD and no phase post-selection TF-QKD(NPP-TFQKD), are very promising for long-distance applications. However, there are still some gaps between theory and practice in these protocols. Concretely, a finite-key size analysis is still missing, and the intensity fluctuations are not taken into account. To address the finite-key size effect, we first give the key rate of NPP-TFQKD against collective attack in finite-key size region and then prove it can be against coherent attack. To deal with the intensity fluctuations, we present an analytical formula of 4-intensity decoy state NPP-TFQKD and a practical intensity fluctuation model. Finally, through detailed simulations, we show NPP-TFQKD can still keep its superiority of high key rate and long achievable distance.