Improved resonator measurement using 1-port cryogenic calibration

Loss measurements are critical for the superconducting qubit community as the coherence of quantum systems are limited by loss through energy relaxation. Due to geometry limitations, many 3D cavities as well as quantum limited amplifiers, are measured in reflection. However, there’s no known method to correct errors caused by impedance mismatch in Qi extraction for reflection mode. Thus, a calibration down to the device under test is necessary to improve measurement accuracy. In this talk, we will briefly discuss why we need calibration for reflection measurement and then show the difference of before and after applying the 1-port databased SOL calibration introduced in the earlier talk in experiment of measuring both 3D and 2D over-coupled resonators.