Figure 9

The maximum gain versus the pump magnitude and detuning. The maximum gain$G_{\max }=max\{G\}$ at the optimal signal phaseυ, versus the parametric pump magnitude κ and detuningΔ, with time units chosen so that $\gamma =1$and $\chi =0.25$.The two plots show different camera perspectives of the same plotted data. Theplot is made from summing 300 terms of the appropriate hypergeometric series. Thesummation is not normalised, and thus the gain values are only correct up to ascale; however, the shape of the plot is indicative.