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cs.IT updates on arXiv.org

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Alternative Anti-Quantum-Channel Disturbance Decoder for Quantum Key Distribution
Huaxing Xu, Shaohua Wang, Yang Huang, Yaqi Song, Changlei Wang · 2019-04-06 · via cs.IT updates on arXiv.org

In the letter, we propose an anti-quantum-channel disturbance decoder for quantum key distribution (QKD). The decoder is based on a quarter-wave plate reflector-Michelson (Q-M) interferometer, with which the QKD system can be free of polarization disturbance caused by quantum channel and optical devices in the system. The theoretical analysis indicates that the Q-M interferometer is immune to polarization-induced signal fading and its corresponding operator is Pauli Matrix σ2, which naturally satisfies the anti-disturbance condition. A Q-M interferometer based time-bin phase encoding QKD setup is demonstrated and the experimental results show that the QKD setup works stably with a low quantum bit error rate and an average safe key rate about 7.34 kbps over 50.4 km standard optical fiber for two hours in the lab.

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