研究目的
To improve the secure key rate of measurement device independent quantum key distribution (MDI-QKD) by combining it with real-time selection (RTS) method to filter out intervals with high channel transmittance caused by atmospheric turbulence.
研究成果
The MDI-QKD with RTS has a maximum tolerant loss of 55 dB, which is 8 dB larger than the original MDI-QKD protocol. It shows the modified scheme can save some signals from high loss, when the key rate could have been zero without RTS. Meanwhile, finite key analysis suggests that the increase in the signal length helps to improve the performance of the modified protocol. These results should prove useful in the design of practical free-space quantum key distribution systems.
研究不足
The modified MDI-QKD scheme discards a small part of signal, making the secure key rate close to but still a little lower than that of the ideal model. The next step would be to save more signals from the high turbulence.
1：Experimental Design and Method Selection:
The study combines RTS method with MDI-QKD to address the time-dependent transmittance caused by atmospheric turbulence. An iterative algorithm is used to determine the optimal threshold for post-selection.
2：Sample Selection and Data Sources:
The study uses numerical simulation to compare the performances of MDI-QKD with RTS and the original MDI-QKD under different atmospheric conditions.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned in the abstract.
4：Experimental Procedures and Operational Workflow:
The modified MDI-QKD scheme filters out signals with high transmittance to improve the key rate. The optimal threshold is determined in advance to balance the decrease in the total number of signals and the increase in average transmittance.
5：Data Analysis Methods:
Numerical simulation is used to analyze the secure key rate of the modified MDI-QKD scheme under different levels of turbulence and compare it with that of the traditional MDI-QKD.
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