Free-space measurement-device-independent quantum-key-distribution protocol using decoy states with orbital angular momentum
Wang Lea), Zhao Sheng-Mei†a),b), Gong Long-Yanc), Cheng Wei-Wena)
       
The key generation rate against the transmission distance with different strength of AT and different link attenuations. Panel (a) is for different AT and the same atmospheric attenuation, where α is 1.38×10−4 (0.6 dB/km). Panel (b) is for different link attenuations and the same AT, where is set to 10−15 m−2/3.