Extended Data Fig. 6: Effect of the FC pump on the gain and added noise.

(a) The on/off gain (that is, not referenced to a through) as a function of frequency, when the FC pump is off (yellow) and when it is on (blue). (b) The added noise is plotted within the same frequency range, when the FC pump is off (yellow) and when it is on (blue). (c) The added noise of the bin centered at 7 GHz is plotted as a function of the TWPAC gain, when the FC pump is off (yellow) and when it is on (blue). The black line represents the model N_sys = N₁ + N₂/G.