Characterizing cryogenic amplifiers with a matched temperature-variable noise source

Slawomir Simbierowicz; Visa Vesterinen; Joshua Milem; Aleksi Lintunen; Mika Oksanen; Leif Roschier; Leif Grönberg; Juha Hassel; David Gunnarsson; Russell E. Lake

doi:10.1063/5.0028951

Characterizing cryogenic amplifiers with a matched temperature-variable noise source

Slawomir Simbierowicz^* (Corresponding Author), Visa Vesterinen, Joshua Milem, Aleksi Lintunen, Mika Oksanen, Leif Roschier, Leif Grönberg, Juha Hassel, David Gunnarsson, Russell E. Lake

^*Corresponding author for this work

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

24 Citations (Scopus)

Abstract

We present a cryogenic microwave noise source with a characteristic impedance of 50 ω, which can be installed in a coaxial line of a cryostat. The bath temperature of the noise source is continuously variable between 0.1 K and 5 K without causing significant back-action heating on the sample space. As a proof-of-concept experiment, we perform Y-factor measurements of an amplifier cascade that includes a traveling wave parametric amplifier and a commercial high electron mobility transistor amplifier. We observe system noise temperatures as low as 680-200+20 mK at 5.7 GHz corresponding to 1.5-0.7+0.1 excess photons. The system we present has immediate applications in the validation of solid-state qubit readout lines.

Original language	English
Article number	034708
Number of pages	11
Journal	Review of Scientific Instruments
Volume	92
Issue number	3
DOIs	https://doi.org/10.1063/5.0028951
Publication status	Published - 11 Mar 2021
MoE publication type	A1 Journal article-refereed

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10.1063/5.0028951

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AU - Simbierowicz, Slawomir

AU - Vesterinen, Visa

AU - Milem, Joshua

AU - Lintunen, Aleksi

AU - Oksanen, Mika

AU - Roschier, Leif

AU - Grönberg, Leif

AU - Hassel, Juha

AU - Gunnarsson, David

AU - Lake, Russell E.

PY - 2021/3/11

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AB - We present a cryogenic microwave noise source with a characteristic impedance of 50 ω, which can be installed in a coaxial line of a cryostat. The bath temperature of the noise source is continuously variable between 0.1 K and 5 K without causing significant back-action heating on the sample space. As a proof-of-concept experiment, we perform Y-factor measurements of an amplifier cascade that includes a traveling wave parametric amplifier and a commercial high electron mobility transistor amplifier. We observe system noise temperatures as low as 680-200+20 mK at 5.7 GHz corresponding to 1.5-0.7+0.1 excess photons. The system we present has immediate applications in the validation of solid-state qubit readout lines.

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Characterizing cryogenic amplifiers with a matched temperature-variable noise source

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