Figure 1
From: Optomechanically-induced transparency in parity-time-symmetric microresonators
OMIT in active-passive-coupled micro-resonators, with a tunable gain-loss ratio.
The similarity of the passive OMIT and the three-level EIT is well-known6; in parallel, the active OMIT provides a COM analog of the optical inverted-EIT34 (see the energy levels with an input gain). Here |0i〉 = |n1, n2, nm〉, |11〉 = |n1 + 1, n2, nm〉, |12〉 = |n1, n2 + 1, nm〉, |1m〉 = |n1, n2, nm + 1〉, while n1,2 and nm denote the number of photons and phonons, respectively.
