Security of quantum key distribution with passive basis choice and detection-efficiency mismatch for a realistic satellite setup

• URL: http://arxiv.org/abs/2608.09793v1
• Date: Mon, 10 Aug 2026 16:14:36 GMT
• Title: Security of quantum key distribution with passive basis choice and detection-efficiency mismatch for a realistic satellite setup
• Abstract summary: Detection-efficiency mismatch is a common problem in quantum key distribution systems.<n>We present a more precise estimation of the secret key rate for the BB84 protocol with the passive basis choice.
• Score: 39.146761527401424
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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