面向真实卫星场景的被动基选择与探测效率失配下量子密钥分发的安全性
Security of quantum key distribution with passive basis choice and detection-efficiency mismatch for a realistic satellite setup
浏览论文内容
中文总结 AI 辅助
本文针对真实卫星QKD场景中探测效率失配显著的问题，提出适配诱骗态方法的被动基选择BB84协议秘密密钥率精确估计方法，为墨子号卫星与兹韦尼哥罗德地面站间QKD实验提供密钥率估计。
中文摘要 AI 辅助
探测效率失配是真实量子密钥分发（QKD）系统中的常见问题。现有针对被动基选择场景的安全性证明仅在探测效率失配较小时给出非零的秘密密钥率，但真实场景中探测效率失配可能十分显著。本文针对采用被动基选择的BB84协议，提出了更精确的秘密密钥率估计方法，该方法考虑了四个阈值探测器间的探测效率失配，并对 decoy-state 方法（诱骗态方法）进行了适配。该方法被用于估计墨子号（Micius）卫星与兹韦尼哥罗德（Zvenigorod）地面站间QKD实验的秘密密钥率。
英文摘要
Detection-efficiency mismatch is a common problem in realistic quantum key distribution (QKD) systems. The existing security proofs for the case of the passive basis choice provide a nonzero secret key rate only for a small detection-efficiency mismatch. Unfortunately, in realistic setups, the detection-efficiency mismatch can be significant. Here we present a more precise estimation of the secret key rate for the BB84 protocol with the passive basis choice, which accounts for the detection-efficiency mismatch between four threshold detectors as well as an adaptation of the decoy-state method. The suggested approach is used to estimate the secret key rate in a QKD experiment between the Micius satellite and the Zvenigorod ground station.
