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Practical issues of twin-field quantum key distribution

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arxiv 1901.04264 v3 pith:VDDAILF7 submitted 2019-01-14 quant-ph

Feng-Yu Lu , Zhen-Qiang Yin , Rong-Wang , Guan-Jie Fan-Yuan , Shuang Wang , De-Yong He , Wei Chen , 1Wei Huang
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Bing-Jie Xu Guang-Can Guo Zheng-Fu Han
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classification quant-ph
keywords intensitynpp-tfqkdfinite-keysizestillattackdistributionfluctuations
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Twin-Field Quantum Key Distribution(TF-QKD) protocol and its variants, such as Phase-Matching QKD(PM-QKD), sending or not QKD(SNS-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.

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  1. General sending-or-not-sending twin field protocol for quantum key distribution with asymmetric source parameters

    quant-ph 2019-08 conditional novelty 5.0 of 10

    A security proof and simulation show that SNS twin-field QKD can be run with fully asymmetric source parameters while retaining security and substantially improving key rates on asymmetric channels.

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