Quantum Computer Controlled by Superconducting Digital Electronics at Millikelvin Temperature
Abstract
Current superconducting quantum computing platforms face significant scaling challenges, as individual signal lines are required for control of each qubit. This wiring overhead is a result of the low level of integration between control electronics at room temperature and qubits operating at millikelvin temperatures, which raise serious doubts among technologists about whether utility-scale quantum computers can be built. A promising alternative is to utilize cryogenic, superconducting digital control electronics that coexist with qubits. Here, we report the first multi-qubit system integrating this technology. The system utilizes digital demultiplexing, breaking the linear scaling of control lines to number of qubits. We also demonstrate single-qubit fidelities above 99%, and up to 99.9%. This work is a critical step forward in realizing highly scalable chip-based quantum computers.
Cite
@article{arxiv.2503.09879,
title = {Quantum Computer Controlled by Superconducting Digital Electronics at Millikelvin Temperature},
author = {Caleb Jordan and Jacob Bernhardt and Joseph Rahamim and Alex Kirichenko and Karthik Bharadwaj and Louis Fry-Bouriaux and Aaron Somoroff and Katie Porsch and Kan-Ting Tsai and Jason Walter and Adam Weis and Meng-Ju Yu and Mario Renzullo and Jerome Javelle and Chris Checkley and Oleg Mukhanov and Daniel Yohannes and Igor Vernik and Shu-Jen Han},
journal= {arXiv preprint arXiv:2503.09879},
year = {2026}
}
Comments
Updated some language, corrected errors in references, updated author list