Transient response of quasiparticle injected superconducting links

We have fabricated submicron injection‐controlled NbN links with gain and measured their injection‐triggered superconducting‐to‐normal transition to occur in 0.5–2.6 ns at 4 K, governed by condensate dynamics. The transient pulse shape displays a rising‐edge kinetic‐inductance spike and a strong dependence on the amplitude of the injected quasiparticle current similar to microbridges driven by supercritical currents. A modified dynamic effective‐temperature model is used to interpret the transient time and the pulse shape.

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