Figure 3
From: Gain, noise and intermodulation in a nonlinear superconducting resonator
Frequency response of the parametric amplifier with the pump turned off and the pump turned on. The pump frequency is which is 1.55 MHz below the resonant frequency of the resonator in the linear regime. The pump power is −83.8 dBm at the input of the sample box. The red line is a fit to the theory made by adjusting the strength of the Kerr nonlinearity.