More is better - High throughput of qubit measurements for materials study

Despite great advances and improvements in the performance of superconducting qubits through changes in device design and geometry, significant improvements in materials remain elusive. Qubits performance varies significantly across devices, wafers and cooldowns and so more trials are needed to get a true estimate of performance. When testing the improvement of various new materials or fabrication processes, it is important to do true A/B testing with enough statistics from multiple qubits, chips and wafers. This creates a bottleneck, as dilution refrigerators’ cycle time adds days to the measurement time.

Using cryo-switches and a multiplexing of signals, we can increase the throughput of our dilution refrigerator. By saving on cycle time to change the samples, we effectively double our capacity. More importantly, this system is benchmarked against our current metrology measurement system and does not show significant statistical difference in single qubit performance metrics.