High-throughput qubit measurements for systematic material improvement

Superconducting qubit coherence remains a bottleneck towards fault-tolerant quantum computation and is affected by many factors, such as circuit design, fabrication, and measurement environment. Isolating contributions of material growth and processing during the qubit fabrication from other factors requires a dedicated chip design and fixed measurement infrastructure. In addition, capturing coherence fluctuations, over time, across a chip, or from chip to chip, requires a setup capable of efficient bring-up and fast high-throughput coherence assessment.

Here, we will discuss a high-throughput measurement setup that is compatible with research laboratories and is geared towards obtaining meaningful statistics for material improvements. We will describe the cryogenic setup designed to measure over 40 qubits per cooldown, the automation and runtime optimization of qubit characterization using an open-source RFSoC-based qubit controller (QICK), and early fabrication results.