Application of a VNA for Measurement of Superconducting Microwave Resonators

With the evolution of quantum-based computing using superconducting cryogenic technology, there is an increased need to ensure very precise Qubit control using cryogenic resonators. With this comes the challenge, of making these high Q resonator measurements at very low temperatures using traditional VNA measurements. In this presentation based on worked done with the team at NIST, Google and Jilla Labs at UC Boulder, we will discuss specifically the calibration approach that was used to help improve the resonator measurements. It will focus on the use of the traditional closed form calibration device measurements versus the use of the databased calibration methodologies. In addition, other calibration and de-embedding approaches will be discussed that help improve measurements.