期刊
QUANTUM INFORMATION PROCESSING
卷 19, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1007/s11128-020-02859-3
关键词
Quantum catalysis; Continuous-variable; Measurement-device-independent; Quantum key distribution
资金
- National Natural Science Foundation of China [61572529, 61821407, 11664017, 11964013]
- Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province
- Postgraduate Scientific Research Innovation Project of Hunan Province [CX20190126]
- Postgraduate Independent Exploration and Innovation Project of Central South University [2019zzts070]
The continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) is a promising candidate for the immunity to side-channel attacks, but unfortunately seems to face the limitation of transmission distance in contrast to discrete-variable (DV) counterpart. In this paper, we suggest a method of improving the performance of CV-MDI-QKD involving the achievable secret key rate and transmission distance by using zero-photon catalysis (ZPC), which is indeed a noiseless attenuation process. The numerical simulation results show that the transmission distance of ZPC-based CV-MDI-QKD under the extreme asymmetric case is better than that of the original protocol. Attractively, in contrast to the previous single-photon subtraction (SPS)-based CV-MDI-QKD, the proposed scheme enables a higher secret key rate and a longer transmission distance. In particular, the ZPC-based CV-MDI-QKD can tolerate more imperfections of detectors than both the original protocol and the SPS-based CV-MDI-QKD.
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