Figure 4: Simulation of edge-state transport.
From: Quantum simulation of 2D topological physics in a 1D array of optical cavities
(a) Calculated photon transmission 
for 
with φ0=1/6. The frequency of the probing light, ω=−2.2κ, is located in the middle of the first band gap. There is one-edge mode in this large band gap. (b) Calculated photon transmission when the probing light frequency ω=−1.0κ is located in the smaller second gap. Two-edge modes are present and interference patterns due to their phase velocity mismatch are observed. (c) Calculated average OAM displacement 
(red dots) for 
with φ0=1/6. Also shown is its s.d. indicated by the blue error bars. It is calculated by assuming a Gaussian distributed random shift δλ in the cavity resonance frequency with a s.d. σ(δλ)=0.1κ. The grey areas mark the frequency ranges of the band gaps. (d) 
(red dots) and its s.d. (blue error bars) for 
with φ0=1/20. In a–d, the size of the simulator N=10. The OAM included in the calculation is l∈[−50,50]. Open and periodic boundary conditions are used in the x and y direction. The photon loss is γ=0.1κ in a and b, and γ=0.2κ in c and d.
