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We present measurements of an amplifier based on a dc superconducting quantuminterference device (SQUID) with submicron Al-AlOx-Al Josephson junctions. Thesmall junction size reduces their self-capacitance and allows for the use ofrelatively large resistive shunts while maintaining nonhysteretic operation.This leads to an enhancement of the SQUID transfer function compared to SQUIDswith micron-scale junctions. The device layout is modified from that of aconventional SQUID to allow for coupling signals into the amplifier with asubstantial mutual inductance for a relatively short microstrip coil.Measurements at 310 mK exhibit gain of 32 dB at 1.55 GHz.

Microstrip superconducting quantum interference device amplifiers with submicron Josephson junctions: enhanced gain at gigahertz frequencies