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Members of the HRL Quantum Team, Collaborators, Michael Abraham, Edwin Acuna, Tower S. Adams, Moonmoon Akmal, Matthew R. Alfaro, I. Alvarado, Jacob Amontree, Carter Andrews, Reed W. Andrews, Michael Antcliffe, Andre R. Aséncio, Ryan M. Avila Batres, Cynthia D. Baringer, David W. Barnes, Katherine M. Beech, Russell G. Blakey, Zachery T. Bloom, Aaron J. Bluestone, et al (234) (Apr 20 2026).
Abstract: Commercially-relevant quantum computers will require large numbers of high-performing qubits that can be manufactured, integrated, and controlled at scale. Silicon exchange-only (EO) qubits are a strong candidate modality due to their control-signal simplicity and compatibility with advanced semiconductor manufacturing, but questions remain around the achievability of sufficiently low noise and a scalable control and wiring solution. Here we introduce a quantum processing unit composed of a custom-designed cryogenic CMOS controller, a novel high-density superconducting ribbon cable, and a low-noise EO qubit device. The quantum chip features a three-rail array of 54 exchange-coupled quantum dots, configurable to host up to 18 EO qubits. We integrate and use these components to demonstrate qubit performance for both single-qubit and entangling operations that advances the EO state of the art by an order of magnitude. We further validate this system by implementing a distance-5 repetition code and a quantum error detecting code then make detailed comparisons with simulations. Our approach facilitates a utility-scale quantum computer with manageable operational and capital requirements.
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