Security of quantum key distribution with detection-efficiency mismatch in the multiphoton case

• URL: http://arxiv.org/abs/2004.07809v3
• Date: Mon, 18 Jul 2022 18:27:48 GMT
• Title: Security of quantum key distribution with detection-efficiency mismatch in the multiphoton case
• Authors: Anton Trushechkin
• Abstract summary: Current security of QKD with detection-efficiency mismatch rely on the assumption of the single-photon light source on the sender side or on the assumption of the single-photon input of the receiver side. Here we present a rigorous security proof without these assumptions and, thus, solve this important problem and prove the security of QKD with detection-efficiency mismatch against general attacks.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Detection-efficiency mismatch is a common problem in practical quantum key distribution (QKD) systems. Current security proofs of QKD with detection-efficiency mismatch rely either on the assumption of the single-photon light source on the sender side or on the assumption of the single-photon input of the receiver side. These assumptions impose restrictions on the class of possible eavesdropping strategies. Here we present a rigorous security proof without these assumptions and, thus, solve this important problem and prove the security of QKD with detection-efficiency mismatch against general attacks (in the asymptotic regime). In particular, we adapt the decoy state method to the case of detection-efficiency mismatch.

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