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Figure 3 | EPJ Quantum Technology

Figure 3

From: Negative-resistance models for parametrically flux-pumped superconducting quantum interference devices

Figure 3

The admittance expansion to higher order, both in external flux and in junction phase, gives a more complete model for the three-wave degenerate case. The even harmonics in the flux expansion serve to only modify the net inductance value. The odd harmonics modify the potential gain and phase-sensitivity. This allows for estimation of the saturation effects. As it is in the theory of mixers, we see in the ac-flux expansion that the third-order term compresses the gain-providing first-order term.

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