Rapid Microwave-Only Characterization and Readout of Quantum Dots Using Multiplexed Gigahertz-Frequency Resonators
Damaz de Jong, Christian G. Prosko, Daan M. A. Waardenburg, Lin Han, Filip K. Malinowski, Peter Krogstrup, Leo P. Kouwenhoven, Jonne V. Koski, Wolfgang Pfaff
Abstract
For mesoscopic quantum devices, efficient characterization and high-fidelity readout using only microwave resonators is of great practical interest, especially to investigate the large parameter space frequently occurring in semiconducting devices. This work shows how dc conductance measurements can be substituted with rf measurements through the implementation of gigahertz-frequency resonators. It also demonstrates multiplexed dispersive gate sensing, which detects electron hybridization with high sensitivity, compatible with applications in quantum information processing. These results present intriguing opportunities for high-speed measurement of quantum transport.