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Inicio  /  Applied Sciences  /  Vol: 12 Par: 9 (2022)  /  Artículo
ARTÍCULO
TITULO

Finite-Key Analysis of 1-Decoy Method Quantum Key Distribution with Intensity Fluctuation

Chun Zhou    
Yu Zhou    
Yangbin Xu    
Yang Wang    
Yifei Lu    
Musheng Jiang    
Xiaoxu Zhang and Wansu Bao    

Resumen

The decoy state quantum key distribution (QKD) protocol is proven to be an effective strategy against the photon number splitting attack. It was shown that the 1-decoy state protocol, easier to implement in the practical QKD system, outperforms the 2-decoy state protocol for block sizes of up to 108 10 8 bits. How intensity fluctuations influence the performance of the 1-decoy state protocol with finite resources remains a pending issue. In this paper, we present a finite-key analysis of the 1-decoy state protocol with intensity fluctuations and obtain the secret key rate formula about intensity fluctuations. Our numerical simulation results show that the stronger the intensity fluctuations, the lower the secret key rate for a small data block size of a few bits. Our research can provide theoretical implications for the selection of data size in the QKD system with intensity fluctuations.

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