We construct a circuit based on PBS and CNOT gates, which can be used to determine whether the input pulse is empty or not according to the detection result of the auxiliary state, while the input state will not be changed. The circuit can be treated as a pre-detection device. Equipping the pre-detection device in the front of the receiver of the quantum key distribution(QKD) can reduce the influence of the dark count of the detector, hence increasing the secure communication distance significantly. Simulation results show that the secure communication distance can reach 516 km and 479 km for QKD with perfect single photon source and decoy-state QKD with weak coherent photon source, respectively.
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机译:South China Normal University Researcher Publishes Findings in Networks (Cost-Optimization-Based Quantum Key Distribution over Quantum Key Pool Optical Networks)
机译:Findings from Shenyang Normal University Yields New Findings on Networks (Quantum Key Distribution Scheme With Key Recycling In Integrated Optical Network)