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

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.

arXiv comment29 pages, 4 figures; v3: significantly revised version: more detailed explanations and proofs to improve readability

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• Deploying hybrid quantum-secured infrastructure for applications: When quantum and post-quantum can work together
• Intensity correlations in decoy-state BB84 quantum key distribution systems
• Quantum Key Distribution with Basis-Dependent Detection Probability
• High-dimensional quantum key distribution with resource-efficient detection
• Loss-tolerant quantum key distribution with detection efficiency mismatch
• Phase error rate estimation in QKD with imperfect detectors
• Imperfect detectors for adversarial tasks with applications to quantum key distribution
• Finite-key security analysis of the decoy-state BB84 QKD with passive measurement
• Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs
• Practical Countermeasure Against Attacks Exploiting Detection Efficiency Mismatch in Quantum Key Distribution
• Energy-time attack on detectors in quantum key distribution