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Figure 5 | EPJ Quantum Technology

Figure 5

From: Controlling the dynamic range of a Josephson parametric amplifier

Figure 5

Circuit model. (a) Distribution of the magnetic flux field Φ(x) along the λ/4-resonator for the fundamental resonator mode j=0, without (red) and with (blue) a Jospehson junction. The additional Josephson inductance changes the boundary condition such that neither the current nor the voltage is zero at position x=d. The resulting increase in the effective wavelength π/(2 k 0 ) is indicated by the dashed blue line. (b) Transmission line resonator of length d with a Josephson junction at the grounded end. (c) Lumped element representation with indicated discretized magnetic flux field Φ j as used in Eq. (21).

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