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

M. P. Defeo, P. Bhupathi, K. Yu, T. W. Heitmann, C. Song, R. McDermott, B. L.T. Plourde

Research output: Contribution to journalArticle

11 Scopus citations

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.

Original languageEnglish (US)
Article number092507
JournalApplied Physics Letters
Volume97
Issue number9
DOIs
StatePublished - Aug 30 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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