Twin-field quantum key distribution with passive-decoy state

• URL: http://arxiv.org/abs/2011.07443v2
• Date: Tue, 17 Nov 2020 02:27:04 GMT
• Title: Twin-field quantum key distribution with passive-decoy state
• Authors: Jun Teng, Feng-Yu Lu, Zhen-Qiang Yin, Guan-Jie Fan-Yuan, Rong Wang, Shuang Wang, Wei Chen, Wei Huang, Bing-Jie Xu, Guang-Can Guo, Zheng-Fu Han
• Abstract summary: We propose passive-decoy based TF-QKD, in which we combine TF-QKD with the passive-decoy method. We present a simulation comparing the key generation rate with that in active-decoy, the result shows our scheme performs as good as active decoy TF-QKD.
• Score: 22.26373392802507
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Twin-Field quantum key distribution (TF-QKD) and its variants, e.g. Phase-Matching QKD, Sending-or-not-sending QKD, and No Phase Post-Selection TFQKD promise high key rates at long distance to beat the rate distance limit without a repeater. The security proof of these protocols are based on decoy-state method, which is usually performed by actively modulating a variable optical attenuator together with a random number generator in practical experiments, however, active-decoy schemes like this may lead to side channel and could open a security loophole. To enhance the source security of TF-QKD, in this paper, we propose passive-decoy based TF-QKD, in which we combine TF-QKD with the passive-decoy method. And we present a simulation comparing the key generation rate with that in active-decoy, the result shows our scheme performs as good as active decoy TF-QKD, and our scheme could reach satisfactory secret key rates with just a few photon detectors. This shows our work is meaningful in practice.

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