Figure 2

(a) The typical EIT (dark blue line) and AT splitting (black line) spectra. (b) The amplitude variation versus \(\Omega _{B-MW}\) and (c) \(\Omega _{A-MW}\) in dual-tone and single-tone microwave field cases. The amplitude variations in (b) and (c) are obtained at the resonant frequency (dash line) in (a). During the simulation, \(\varGamma _{1} = 0\), \(\varGamma _{2} = 2\pi \times 6.1\text{ MHz}\), \(\varGamma _{3} = 2 \pi \times 0.003\text{ MHz}\), \(\varGamma _{4} = \varGamma _{5} = 2 \pi \times 0.002\text{ MHz}\), \(\varOmega _{p} = 0.79 \varGamma _{2}\), \(\varOmega _{c} = 1.4\varGamma _{2}\)