Fig. 1. A diagram of QKD post-processing

Fig. 2. An architecture of coherent-state discrete-modulated CVQKD protocol^[19]

Fig. 3. Qubit extraction in the squashing model^[19]

Fig. 4. Key generation rate of the coherent-state discrete-modulated CVQKD protocol against channel attenuation^[19]

Fig. 5. The receiver setup of the coherent-detection polarization-encoding CVQKD protocol^[20]

Fig. 6. Key generation rate of the coherent-detection polarization-encoding CVQKD protocol, compared with the key rate under perfect SPD^[20]

Fig. 7. An architecture of coherent-detection time-bin encoding protocol^[21]

Fig. 8. Key generation rates of the coherent-detection time-bin encoded protocol^[21]