Loss control-based QKD with noisy devices

Quantum cryptography protocols aimed at providing communication security are based on the fundamental principle of quantum physics that non-orthogonal quantum states cannot be perfectly distinguished. The majority of practically applicable quantum cryptography realizations belong to the so-called device-dependent class of quantum key distribution (QKD) protocols. Security of the device-dependent protocols cannot be ensured without considering all the noises in the incorporated devices. Here, we analyze the influence of the preparation and detection noise on the loss control-based QKD that is built on continuous monitoring of the leakages in the fiber channel. By estimating the achievable secret key generation rates, we show the robustness of the loss control approach to trusted preparation and detection noises. Our findings demonstrate a positive impact of the trusted preparation noise on the QKD based on loss control for reverse and direct reconciliation scenarios.