Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite-key effects

Jiang，Cong1; Hu，Xiao Long1; Xu，Hai1; Yu，Zong Wen1,2; Wang，Xiang Bin1,3,4,5,6

2020-05-01

10.1088/1367-2630/ab81b7

NEW JOURNAL OF PHYSICS   影响因子和分区

1367-2630

Odd-parity error rejection (OPER), in particular the method of actively odd parity pairing (AOPP), can drastically improve the asymptotic key rate of sending-or-not-sending twin-field (SNS-TF) quantum key distribution (QKD). However, in practice, the finite-key effects have to be considered for the security. Here, we propose a zigzag approach to verify the phase-flip error of the survived bits after OPER or AOPP. Based on this, we can take all the finite-key effects efficiently in calculating the non-asymptotic key rate. Numerical simulation shows that our approach here produces the highest key rate over all distances among all existing methods, improving the key rate by more than 100% to 3000% in comparison with different prior art methods with typical experimental setting. These verify the advantages of the AOPP method with finite data size. Also, with our zigzag approach here, the non-asymptotic key rate of SNS-TF QKD can by far break the absolute bound of repeater-less key rate with whatever detection efficiency. We can even reach a non-asymptotic key rate more than 40 times of the practical bound and 13 times of the absolute bound with 10 pulses.

finite key effects odd parity error rejection SNS-TF QKD

SCI ; EI

英语

其他

Ministration of Science and Technology of China through The National Key Research and Development Program of China[2017YFA0303901] ; National Natural Science Foundation of China[11474182][11774198][U1738142]

Physics

Physics, Multidisciplinary

WOS:000538449800001

IOP PUBLISHING LTD

20202308785851

Numerical methods ; Quantum cryptography

Numerical Methods:921.6

PHYSICS

2-s2.0-85085699153

Scopus

1.State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Data Communication Science and Technology Research Institute,Beijing,100191,China
3.Shanghai Branch,CAS Center for Excellence and Synergetic Innovation,Ctr. in Quantum Information and Quantum Physics,University of Science and Technology of China,Shanghai,201315,China
4.Jinan Institute of Quantum Technology,SAICT,Jinan,250101,China
5.Shenzhen Institute for Quantum Science and Engineering,Physics Department,Southern University of Science and Technology,Shenzhen,518055,China
6.Center for Atomic and Molecular Nanosciences,Tsinghua University,Beijing,100084,China

Jiang，Cong,Hu，Xiao Long,Xu，Hai,et al. Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite-key effects[J]. NEW JOURNAL OF PHYSICS,2020,22(5).

Jiang，Cong,Hu，Xiao Long,Xu，Hai,Yu，Zong Wen,&Wang，Xiang Bin.(2020).Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite-key effects.NEW JOURNAL OF PHYSICS,22(5).

Jiang，Cong,et al."Zigzag approach to higher key rate of sending-or-not-sending twin field quantum key distribution with finite-key effects".NEW JOURNAL OF PHYSICS 22.5(2020).