Practical quantum-key-distribution systems with detector efficiency mismatch: attacks and secret key rates

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Imperfections in devices are inevitable in practice.  In this talk, we focus on the imperfection of QKD systems in the detectors, namely that the efficiencies of the detectors are not completely identical.  We show some practical attacks that specifically exploit this efficiency mismatch and demonstrate how Eve may obtain some information on the final key if Alice and Bob are unaware of the attack.  Also, we discuss the upper and lower bounds on the secret key rates both with and without the assumption of the efficiency mismatch