Fig. 1. Model of key extraction system based on MIMO atmospheric optical channel

Fig. 2. Correlation coefficient model

Fig. 3. Schematic diagram of step-by-step transmission process of light waves

Fig. 4. Comparison of phase structure functions of phase screens and phase screens generated by spectral inversion method with theoretical values

Fig. 5. Sample distribution of instantaneous light intensity of receiving surface light field samples under different conditions

Fig. 6. Correlation between correlation of signal power received by two neighboring receivers and variation between receiver aperture diameters

Fig. 7. Correlation between two neighboring receivers under different propagation distance conditions as a function of distance between two receivers

Fig. 8. Correlation between two neighboring receivers under different atmospheric turbulence intensity conditions as a function of distance between two receivers

Fig. 9. Relationship between wavelengths of correlated light waves between two neighboring receivers under different atmospheric turbulence intensity conditions

Fig. 10. Relationship between signal-to-naise and key capacity