On-chip cryogenic multiplexing of Si/SiGe quantum devices

• URL: http://arxiv.org/abs/2410.13721v1
• Date: Thu, 17 Oct 2024 16:26:41 GMT
• Title: On-chip cryogenic multiplexing of Si/SiGe quantum devices
• Authors: M. A. Wolfe, Thomas McJunkin, Daniel R. Ward, DeAnna Campbell, Mark Friesen, M. A. Eriksson,
• Abstract summary: We integrate classical circuitry and Si/SiGe quantum devices on the same chip, providing a test bed for qubit scale-up. We leverage this set-up to probe device properties across a 6x6mm$2$ array of 16 Hall bars. Building upon these results, we propose a vision for readout in a large-scale silicon quantum processor with a limited number of control connections.
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• Abstract: The challenges of operating qubits in a cryogenic environment point to a looming bottleneck for large-scale quantum processors, limited by the number of input-output connections. Classical processors solve this problem via multiplexing; however, on-chip multiplexing circuits have not been shown to have similar benefits for cryogenic quantum devices. In this work we integrate classical circuitry and Si/SiGe quantum devices on the same chip, providing a test bed for qubit scale-up. Our method uses on-chip field-effect transistors (FETs) to multiplex a grid of work zones, achieving a nearly tenfold reduction in control wiring. We leverage this set-up to probe device properties across a 6x6mm$^2$ array of 16 Hall bars. We successfully operate the array at cryogenic temperatures and high magnetic fields where the quantum Hall effect is observed. Building upon these results, we propose a vision for readout in a large-scale silicon quantum processor with a limited number of control connections.

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