Fig. 1. Experimental system. (a) Schematic of the experimental setup; (b) schematic of spatial distribution of twin beams with Bessel distribution

Fig. 2. Results of spatial distribution and intensity difference squeezing of twin beam. (a) Spatial distribution of twin beam with Gaussian distribution; (b) spatial distribution of twin beam with Bessel distribution; (c) intensity difference squeezing of twin beam with Gaussian distribution; (d) intensity difference squeezing of twin beam with Bessel distribution

Fig. 3. Results of the spatial distribution and intensity difference squeezing of the twin beam after the self-healing(loss introduced by obstacles is about 70%). (a) Spatial distribution of the twin beam after the self-healing; (b) intensity difference squeezing of the twin beam with one-side loss; (c) intensity difference squeezing of the twin beam with one-side loss