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Figure 5 | EPJ Quantum Technology

Figure 5

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

Figure 5

This figure depicts the equivalent signal impedance of the flux-pumped SQUID in the three-wave nondegenerate case. The constituent inductances are given by Eq. (66). In the limit that the ac-flux is small such that γ 0 1, the inductance L n , 0 is simply the quiescent Josephson inductance and L n , 2 Φ ac 2 . The L n , 2 acquires an imaginary component due to the external (real) admittance at the idler frequency. A positive, imaginary inductance is a negative, real impedance, which may therefore provide gain.

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