研究目的
Analyzing side channels in free-space QKD sender and receiver implementations, focusing on dependencies and side channels for the spatial degree of freedom.
研究成果
The research underscores the importance of considering the spatial degree of freedom in free-space QKD systems to prevent security loopholes. It suggests spatial filtering and advanced receiver designs as solutions to reduce detection efficiency mismatch and enhance system security.
研究不足
The study identifies challenges in ensuring spatial indistinguishability and matching detection efficiencies for all spatial modes, highlighting the need for advanced receiver designs to mitigate these issues.
1：Experimental Design and Method Selection:
The study analyzes side channels in QKD implementations by examining the spatial degree of freedom's impact on security.
2：Sample Selection and Data Sources:
Uses a collimated laser beam to analyze detection efficiency dependencies on the incoming beam's direction.
3：List of Experimental Equipment and Materials:
Includes laser diodes, interference filters, beamsplitters, wave plates, and fiber couplers.
4：Experimental Procedures and Operational Workflow:
Involves varying the angle of the input beam and measuring detector signals to assess efficiency mismatch.
5：Data Analysis Methods:
Utilizes entropy functions and efficiency mismatch calculations to evaluate security implications.
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