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Characterizing cryogenic amplifiers with a matched temperature-variable noise source
- Publication Year :
- 2020
-
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.<br />Comment: The following article has been accepted by Review of Scientific Instruments. After it is published, it will be found at https://doi.org/10.1063/5.0028951
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2009.03010
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1063/5.0028951