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arXiv · 1912.00503

Study of microwave resonances induced by bias lines of shunted Josephson junctions

Ugur Yilmaz·Sasan Razmkhah·Romain Collot·Juergen Kunert·Ronny Stolz·Pascal Febvre
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Abstract

Bias lines routed over a ground plane naturally form microstrip lines associated with the presence of a capacitance. This can lead to unwanted resonances when coupled to Josephson junctions. This work presents an electrical model of a shunted Josephson junction with its bias lines and pads, fabricated with the 1 kA/cm$^2$ RSFQ niobium process of the FLUXONICS Foundry. A compact LCL T-model is used to simulate the microwave behavior of the bias line, predict resonances and design resonance-free superconducting circuits. The I-V characteristics of three shunted Josephson junctions have been obtained from time-domain simulations done with JSIM and show a good match with the global behavior and experimentally observed resonance at 230 GHz, measured at 4.2 K. The influence of the position and value of a series resistor placed on bias lines is studied to damp unwanted resonances at the junction.

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Ugur Yilmaz, Sasan Razmkhah, Romain Collot, Juergen Kunert, Ronny Stolz, Pascal Febvre. 2019-12-01. Study of microwave resonances induced by bias lines of shunted Josephson junctions. https://doi.org/10.1109/tasc.2020.3004781

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