Author Affiliations
1College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China2School of Physics, Nanjing University, Nanjing 210023, Chinashow less
Fig. 1. Schematic of a chiral QE-microresonator system. A two-level QE is coupled to a whispering-gallery mode microresonator in a chiral way to form the QE-microresonator system. A waveguide is side coupled to the microresonator as input and output ports. A scatterer on the microresonator is considered to introduce backscattering. The arrows represent the propagating direction of a single photon for an input to port 1 (green) or port 2 (red).
Fig. 2. Transmission spectra of a waveguide coupled with a microresonator. The blue solid, red dashed, and green dotted curves are calculated by the TM, ME, and SPT methods, respectively. The settings in the following figures are the same: (a) in the absence of backscattering, (b) and (c) in presence of the backscattering with strengths h = κin and h = 10κin, respectively. See Sec. 3 for other parameters.
Fig. 3. Transmission spectra for a chiral QE-microresonator system without considering the backscattering: (a)–(c) Γ = 0.1γ, Γ = γ, and Γ = 100γ, respectively.
Fig. 4. Transmission spectra for a chiral QE-microresonator system with the QE and the scatterer: (a) Γ = 100γ, h = κin and (b) Γ = 100γ, h = 10κin.
Fig. 5. (a) Transmission spectra for different driving amplitudes αin (corresponding to different pump powers), where the blue solid curve is calculated by the TM method, and the green dash-dotted curve (the red dashed curve, the purple dotted curve) is calculated by the ME method, with (, ). (b) Transmission spectra as a function of αin at different decay rates, where Γ = γ (the blue solid curve) and Γ = 100γ (the red dash-dotted curve) correspond to weak and strong coupling, respectively. Other parameters are κex = κin = 0.5κtol, γ/κtol = 1 × 10−4, g/κtol = 1, and h = κin.