Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz

M. P. Defeo; B. L.T. Plourde

doi:10.1063/1.4742164

Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz

M. P. Defeo, 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 operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K, we observe a minimum system noise temperature of 0.55 ± 0.13 K, dominated by the contribution from the SQUID amplifier.

Original language	English (US)
Article number	052603
Journal	Applied Physics Letters
Volume	101
Issue number	5
DOIs	https://doi.org/10.1063/1.4742164
State	Published - Jul 30 2012

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4742164

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title = "Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz",

abstract = "We present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K, we observe a minimum system noise temperature of 0.55 ± 0.13 K, dominated by the contribution from the SQUID amplifier.",

author = "Defeo, {M. P.} and Plourde, {B. L.T.}",

note = "Funding Information: The authors acknowledge useful discussions with R. McDermott. 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 ECS-0335765).",

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AU - Defeo, M. P.

AU - Plourde, B. L.T.

N1 - Funding Information: The authors acknowledge useful discussions with R. McDermott. 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 ECS-0335765).

PY - 2012/7/30

Y1 - 2012/7/30

N2 - We present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K, we observe a minimum system noise temperature of 0.55 ± 0.13 K, dominated by the contribution from the SQUID amplifier.

AB - We present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth based on the microstrip input-coil resonance of a dc superconducting quantum interference device (SQUID) with submicron Josephson junctions. The noise temperature is measured using two methods: comparing the signal-to-noise ratio of the system with and without the SQUID in the amplifier chain, and using a modified Y-factor technique where calibrated narrowband noise is mixed up to the SQUID amplifier operating frequency. With the SQUID cooled to 0.35 K, we observe a minimum system noise temperature of 0.55 ± 0.13 K, dominated by the contribution from the SQUID amplifier.

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Superconducting microstrip amplifiers with sub-Kelvin noise temperature near 4 GHz

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