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SQUIDs based on self-shunted MoRe-Si(W)-MoRe Josephson junctions

Volodymyr E. Shaternik, Andrii P. Shapovalov, Suvorov, Olexandr, A.A. Kalenyuk, Oleg G. Turutanov, V. Yu. Lyakhno, Pascal Febvre, V. I. Shnyrkov

Published Aug 27, 2018• 0 citations
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We present measurements of an amplifier based on a dc superconducting quantum interference device (SQUID) with submicron Al-AlOx-Al Josephson junctions. The small junction size reduces their self-capacitance and allows for the use of relatively large resistive shunts while maintaining nonhysteretic operation. This leads to an enhancement of the SQUID transfer function compared to SQUIDs with micron-scale junctions. The device layout is modified from that of a conventional SQUID to allow for coupling signals into the amplifier with a substantial mutual inductance for a relatively short microstrip coil. Measurements at 310 mK exhibit gain of 32 dB at 1.55 GHz.