GM-backed HRL demonstrates silicon quantum processor with autonomous error correction inside cryostat

• GM-backed HRL Laboratories published Nature results on a silicon quantum processor that autonomously runs error correction inside a cryostat.
• A custom CMOS controller operated at -450°F near the qubits, replacing racks of room-temperature control electronics for an 18-qubit device.
• Architecture used a high-density superconducting ribbon cable to deliver hundreds of control signals while limiting heat transfer to colder qubits.
• HRL reported control errors about 10x lower than prior demonstrations for this qubit type, with sub-microsecond operations.
• Error rates fell roughly 5x as more qubits were added to a repetition code, supporting scalability claims for the control approach.

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