Figure 2
From: Controllable microwave three-wave mixing via a single three-level superconducting quantum circuit
(a) Modulus of the renormalized transition elements i12 = I12/I0, i23 = I23/I0 and i13 = I13/I0 versus the reduced magnetic flux f. The modulus R(f), given by Eq. (15) and the detuning 
, versus f, are plotted in panels (b) and (c), respectively. Here, 
are the f-dependent transition frequencies (transition frequencies at the optimal point with f = 0.5) between two different energy levels |i〉 and |j〉 (i > j). The SFQC parameters are here taken as EJ/h = 192 GHz, EJ/Ec = 48 and α = 0.8 with h being the Planck constant.
