Mass production of cryogenic quantum devices is crucial for scalable, reliable, and practical quantum technologies. However, in the current architecture of cryogenic systems, particularly in dilution refrigerators, the number of quantum devices that can be tested simultaneously is limited by the available electrical contact pads and wiring. This constraint imposes significant challenges to the scalability and integrability of quantum devices, including the reproducibility and reliability essential for practical applications. With the integration of hundreds or even thousands of quantum devices onto a single chip, a method that allows concurrent measurement in a single cooldown process becomes critical. This project explores the use of a cryogenic on-chip addressable switch network to tackle these limitations, specifically applied to hybrid Josephson Field Effect Transistors (JFETs). Hybrid JFETs combine Josephson junctions and semiconducting field-effect transistors, leveraging unique properties from both materials to enable tunable, low-noise quantum operations.
The on-chip electronic switch network enables sequential access to each device on the chip without requiring extensive wiring for each component, thus significantly reducing the space and cooling requirements of the setup. The student will be involved in designing the cryogenic circuit, developing protocols for efficient device measurement, and conducting low-temperature tests to evaluate device performance across hundreds of devices in one cooldown cycle. By contrasting the measurements of multiple devices, the project will enable a systematic analysis of scalability, reproducibility, and device uniformity. This approach will also offer considerable savings in evaluation time, energy, and cost—factors essential for future large-scale quantum technologies. Through this project, students will gain hands-on experience with cryogenic systems, large-scale electronic integration techniques, and quantum device testing, providing a valuable foundation in advanced quantum hardware design and characterization. This experience aligns with the growing need for scalable quantum architectures and will contribute to the field’s progress towards mass-producible quantum technologies.