Fig. 2
From: Superstrong coupling in circuit quantum electrodynamics
a Reflection magnitude as a function of drive frequency and flux through the loop. The color scale (not shown) is optimized to make the position of resonances maximally visible. The three insets have the same width along the frequency axis and correspond to the three boxed regions on the main plot. b An example slice of a at the external flux 0.525 × h/2e, shown by the horizontal dashed line, where the atomic resonance is expected at around 7 GHz
