# Cryogenic Chip Controls Qubits at Near Absolute Zero

Alex Rivera · July 30, 2026

> Cryogenic Chip Controls Qubits at Near Absolute Zero: The entire thermal budget for a million-qubit machine fits inside the power draw of a single LED…

| Takeaway | Detail |
| --- | --- |
| Cryo-CMOS chips replace hundreds of coaxial cables | A single cryogenic control chip at 0.1 K can multiplex 16–64 qubit control signals onto a few wires, cutting the thermal firehose from room temperature to millikelvin stages. |
| 99.7% single-qubit gate fidelity is already demonstrated | As of mid-2025, a QuTech–imec chip controlling 16 spin qubits in silicon achieved this fidelity, though two-qubit gate fidelity remains lower and is the more relevant metric for error correction. |
| Sub-1 µs feedback latency is feasible for error correction | Current cryo-CMOS designs hit ~100 ns for simple gate operations, meeting the

Canonical: https://www.judgmentcallpodcast.com/2026/07/cryogenic-chip-controls-qubits-at-near-absolute-zero/
Markdown: https://www.judgmentcallpodcast.com/2026/07/cryogenic-chip-controls-qubits-at-near-absolute-zero/index.md