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

doi:10.1063/1.3486156

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

We present measurements of an amplifier based on a dc superconducting quantum interference device (SQUID) with submicron Al- AlO_x -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 language	English (US)
Article number	092507
Journal	Applied Physics Letters
Volume	97
Issue number	9
DOIs	https://doi.org/10.1063/1.3486156
State	Published - Aug 30 2010

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3486156

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

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.",

author = "Defeo, {M. P.} and P. Bhupathi and K. Yu and Heitmann, {T. W.} and C. Song and R. McDermott and Plourde, {B. L.T.}",

note = "Funding Information: This work is supported by the DARPA/MTO QuEST program through a grant from AFOSR. Some of the device fabrication was performed at the Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the National Science Foundation (Grant No. ECS-0335765). The authors acknowledge M. Ware for technical assistance.",

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T2 - Enhanced gain at gigahertz frequencies

AU - Defeo, M. P.

AU - Bhupathi, P.

AU - Yu, K.

AU - Heitmann, T. W.

AU - Song, C.

AU - McDermott, R.

AU - Plourde, B. L.T.

N1 - Funding Information: This work is supported by the DARPA/MTO QuEST program through a grant from AFOSR. Some of the device fabrication was performed at the Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the National Science Foundation (Grant No. ECS-0335765). The authors acknowledge M. Ware for technical assistance.

PY - 2010/8/30

Y1 - 2010/8/30

N2 - 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.

AB - 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.

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

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