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^*
, 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

33 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

Funding

V.V., L.G., and J.H. acknowledge financial support from the Academy of Finland through its Centers of Excellence Program (Project Nos. 312059 and 312294) and Grant No. 321700 and from the EU Flagship on Quantum Technology Grant No. H2020-FETFLAG-2018-03 Project No. 820363 OpenSuperQ.

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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.

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Characterizing cryogenic amplifiers with a matched temperature-variable noise source

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