Quantum Computer Controlled by Superconducting Digital Electronics at Millikelvin Temperature

• URL: http://arxiv.org/abs/2503.09879v1
• Date: Wed, 12 Mar 2025 22:21:28 GMT
• Title: Quantum Computer Controlled by Superconducting Digital Electronics at Millikelvin Temperature
• Authors: Jacob Bernhardt, Caleb Jordan, Joseph Rahamim, Alex Kirchenko, Karthik Bharadwaj, Louis Fry-Bouriaux, Katie Porsch, Aaron Somoroff, Kan-Ting Tsai, Jason Walter, Adam Weis, Meng-Ju Yu, Mario Renzullo, Daniel Yohannes, Igor Vernik, Oleg Mukhanov, Shu Jen Han,
• Abstract summary: Current superconducting quantum computing platforms face significant scaling challenges.<n>A promising alternative is to utilize cryogenic, superconducting digital control electronics that coexist with qubits.<n>This work is a critical step forward in realizing highly scalable chip-based quantum computers.
• Score: 0.5589940740013896
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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