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, Britton Plourde

Research output: Contribution to journalArticle

11 Citations (Scopus)

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

Fingerprint

Josephson junctions
amplifiers
interference
shunts
inductance
transfer functions
layouts
coils
capacitance
augmentation

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Microstrip superconducting quantum interference device amplifiers with submicron Josephson junctions : Enhanced gain at gigahertz frequencies. / Defeo, M. P.; Bhupathi, P.; Yu, K.; Heitmann, T. W.; Song, C.; McDermott, R.; Plourde, Britton.

In: Applied Physics Letters, Vol. 97, No. 9, 092507, 30.08.2010.

Research output: Contribution to journalArticle

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