TITLE

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

AUTHOR(S)
DeFeo, M. P.; Bhupathi, P.; Yu, K.; Heitmann, T. W.; Song, C.; McDermott, R.; Plourde, B. L. T.
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/30/2010, Vol. 97 Issue 9, p092507
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
53421632

 

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