  As quantum computers based on superconducting qubit processors scale,
cryogenic microwave components in the qubit control and readout chain must be
appropriately tested and qualified to ensure consistent and high-fidelity
quantum computation. However, the intersection of superconducting cryogenics
and microwave electronics is a new domain with limited technical and commercial
expertise. In this paper we validate a TaaS (testing-as-a-service) framework
using an organizational workgroup model that consists of (1) a commercial Test
House, (2) standard temperature Component Manufacturer, (3) Academic Partner,
and (4) System Integrator to demonstrate a scalable model for the qualification
of cryogenic microwave components. The goal of this model is to secure the
supply chain and support the rapid growth of Quantum Computing (QC)
technologies. The component test vehicle presented in this paper is a low-noise
amplifier (LNA) which is a crucial component in the cryogenic chain to ensure
adequate signal-to-noise of the qubit readout. We devise standard test metrics
and protocols by which LNA performance is measured, including key parameters
such as gain and flatness, reflection and isolation, operating bandwidth, and
noise figure. We present details of the cryogenic testbed customized for LNA
qualification, outline test methodologies, and present a suite of standard
processes that are used to systematize data collation and reporting. The
testbed is validated by reproducing parameters of a pre-characterized LNA. Its
value is demonstrated by characterizing a proof-of-concept cryogenic LNA
prototype. Finally, we describe the extension of our TaaS framework toward
testing at scale for various active and passive cryogenic components used in
QC.
