2020/09/23 by Jun Teng, Feng-Yu Lu, Zhen-Qiang Yin +8
Computer Science · Physics and Astronomy · #BB84 #Chaos-based Image/Signal Encryption #Key (lock) #Key generation #Photon #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cryptography #Quantum key distribution #Random number generation #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1088/1367-2630/abbab7
openalex publication_date 2020/09/23 · openalex created_date 2020/10/01 · arxiv created 2020/11/17 · arxiv updated 2020/11/18 · openalex updated_date 2026/08/06
Abstract Twin-Field quantum key distribution (TF-QKD) and its variants, e.g. phase-maching QKD, sending-or-not-sending QKD, and no phase post-selection TFQKD promise high key rates at long distance to beat the rate distance limit without a repeater. The security proof of these protocols are based on decoy-state method, which is usually performed by actively modulating a variable optical attenuator together with a random number generator in practical experiments, however, active-decoy schemes like this may lead to side channel and could open a security loophole. To enhance the source security of TF-QKD, in this paper, we propose passive-decoy based TF-QKD, in which we combine TF-QKD with the passive-decoy method. And we present a simulation comparing the key generation rate with that in active-decoy, the result shows our scheme performs as good as active decoy TF-QKD, and our scheme could reach satisfactory secret key rates with just a few photon detectors. This shows our work is meaningful in practice.