Fig. 1. Experimental setup and energy level diagram

Fig. 2. EIT spectrum signal with different enhancement of coupling light

Fig. 3. EIT spectra signal intensity and linewidth at different coupling optical powers

Fig. 4. EIT-AT splitting spectrum at microwave resonance position under different coupling optical field enhancement

Fig. 5. The relationship between signal-to-noise ratio of microwave field and microwave frequency was measured under different coupling optical field enhancements. The microwave power is -8 dBm

Fig. 6. The relationship between signal-to-noise ratio of microwave field and microwave frequency was measured under different coupling optical field enhancements，the microwave power is 0 dBm