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- W3137481180 abstract "We present a cryogenic microwave noise source with a characteristic impedance of 50 $Omega$, 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 $680^{+20}_{-200}$ mK at 5.7 GHz corresponding to $1.5^{+0.1}_{-0.7}$ excess photons. The system we present has immediate applications in the validation of solid-state qubit readout lines." @default.
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- W3137481180 date "2021-03-01" @default.
- W3137481180 modified "2023-10-16" @default.
- W3137481180 title "Characterizing cryogenic amplifiers with a matched temperature-variable noise source" @default.
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- W3137481180 doi "https://doi.org/10.1063/5.0028951" @default.
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