Figure 5From: The circuit quantum electrodynamical Josephson interferometerBackground excitation number n 2 as a function of the phase difference φ and tunnelingJ/γ. Due to a destructive interference, excitations are suppressed for φ=(2m+1)π with integer m. The plot shows the effect for a low nonlinearity U/γ=0.2 and a strong drive Ω/γ=10.Back to article page