A Scalable mK Cryo-CMOS Demultiplexer Chip for Voltage Biasing and High-Speed Control of Silicon Qubit Gates

Large-scale silicon qubit control requires closer integration of control electronics to qubits at the mK stage of the dilution refrigerator to address the wiring bottleneck. We present a mK demultiplexer chip that uses only two input analog voltages and digital control signals, to provide both DC bias and high-speed voltage pulsing for up to 64 qubit terminals. Integrated with a foundry qubit chip on the same PCB and controlled by a 4 K cryo-CMOS controller, mK cryogenic measurements show multi-terminal characterization of a qubit device.