Fig. 1. Atomic structure diagrams. (a) Energy level structure of interacting four-level cold atoms; (b) equivalent energy level structure of super atom; (c) one-dimensional ultra-cold atomic ensemble

Fig. 2. Transmission properties of probe field with Δc=Δd=0 and Ωc=Ωd=5.0 MHz. (a) Ip(L)/Ip(0) versus Δp/2π; (b) gp(2)(L)/gp(2)(0) versus Δp/2π

Fig. 3. Transmission properties of probe field with Δc=2.0 MHz, Δd=0 and Ωc=Ωd=5.0 MHz. (a) Ip(L)/Ip(0) versus Δp/2π; (b) gp(2)(L)/gp(2)(0) versus Δp/2π

Fig. 4. Transmission properties of probe field with Δc=0, Δd=2.0 MHz and Ωc=Ωd=5.0 MHz. (a) Ip(L)/Ip(0) versus Δp/2π; (b) gp(2)(L)/gp(2)(0) versus Δp/2π

Fig. 5. Transmission properties of probe field with Δc=Δd=0. (a) Ip(L)/Ip(0) versus Δp/2π; (b) gp(2)(L)/gp(2)(0) versus Δp/2π