Fig. 1. Simulated results of chaotic laser at J=1.3J_th and κ=4 ns^-1. (a) Time sequence; (b) power spectrum

Fig. 2. Simulated results. (a) h_d versus embedding delay time at J=1.3J_th and κ=4 ns^-1; (b) G_d versus κ

Fig. 3. Simulated hdcomp and G_dversus quantum noise intensity and bandwidth. (a)(b) Different quantum noise bandwidths; (c)(d) different quantum noise intensities

Fig. 4. Schematic illustration of experimental setup for enhancing entropy of chaotic laser using quantum shot noise

Fig. 5. Variation of experimental entropy value of chaotic laser before and after injection of quantum noise with 500 MHz bandwidth and 15 dBm intensity. (a1)--(a4) 3.8 GHz; (b1)--(b4) 5.0 GHz

Fig. 6. Experimental hdcompand G_d versus quantum noise intensity for different quantum noise bandwidths. (a) hdcomp;(b) G_d