RFI-MDI-QKD系统安全密钥率计算方法及装置
By calculating the afterpulse of the SPAD and the detector response probability in the RFI-MDI-QKD system, the method for calculating the security key rate is improved, which solves the calculation deviation problem caused by ignoring the afterpulse in the prior art, and improves the accuracy of the calculation results and the applicability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANJING UNIV OF POSTS & TELECOMM
- Filing Date
- 2023-06-12
- Publication Date
- 2026-07-17
AI Technical Summary
In the RFI-MDI-QKD system, existing technologies ignore the afterpulse of the single-photon avalanche detector (SPAD) when calculating the security key rate, resulting in serious deviations in the calculation results and affecting the matching of the system with the application scenario.
By obtaining the overall afterpulse rate of the RFI-MDI-QKD system, the quantum states at the Alice and Bob ends, and the detector response probability, the afterpulse of the SPAD is calculated. Combined with the required transmission distance, the security key rate is calculated. Taking into account the influence of the afterpulse, the calculation method of the security key rate is improved.
It improves the accuracy of secure key rate calculation, ensures the matching of the RFI-MDI-QKD system with the use case, and enhances communication security.
Smart Images
Figure CN116722975B_ABST