Improved Decoy State Method for Measurement-Device-Independent Quantum Key Distribution

doi:10.3969/j.issn.1671-1122.2024.06.010

Abstract

Abstract:

Measurement-device-independent quantum key distribution (MDI-QKD) is regarded as an efficient and practical building block of quantum networks because it eliminates loopholes on the detection side. Current MDI-QKD protocols implement non-ideal single-photon sources, and the decoy state method has been introduced to improve the key rate. A data processing method for MDI-QKD named the double-scanning method has performed excellently for processing statistical fluctuations. The double-scanning method enables higher key rates when estimating single-photon pair components using the decoy state method. However, this method suffers from requires time-consuming optimization. The article proposed a choosing solution, a novel decoy-state method, to achieve better performance of MDI-QKD than the original decoy-state method while requiring less optimization time than the double-scanning method. In simulations with some experimental parameter values, the article proposed method yielded a higher key rate than the decoy state method. Because no additional scanning optimization is needed, the MDI-QKD protocol with our method is advantageous to its speed and good hardware compatibility.

Key words: quantum key distribution, measurement-device-independent, decoy state method

CLC Number:

TP309

BAI Junlin, YIN Hualei. Improved Decoy State Method for Measurement-Device-Independent Quantum Key Distribution[J]. Netinfo Security, 2024, 24(6): 926-936.

Figures/Tables 5

References 51

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