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Figure 5 | EPJ Quantum Technology

Figure 5

From: Gain, noise and intermodulation in a nonlinear superconducting resonator

Figure 5

Power spectrum measured at the output of the mixer when a signal is applied atΔf= f s fp=10 kHz. Measurements are shown when the pump is on (blue) and when the pump is off (green), for two cases: (a) the phase shifter is tuned for maximum amplification, and (b) the phase shifter is tuned for maximum de-amplification. The measurement reveals both signal and noise gain, and the additional peaks at integer multiples of Δf are due to higher-order intermodulation products of the signal and pump.

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