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Superconducting Qubits

A plug-and-play superconducting quantum controller at millikelvin temperatures enables exceeding 99.9% average gate fidelity

arXiv

Authors: Kuang Liu, Zhiyuan Wang, Xiaoliang He, Siqi Li, Hao Wu, Xiangyu Ren, Zhengqi Niu, Wangpeng Gao, Chenluo Zhang, Pei Huang, Yu Wu, Liliang Ying, Wei Peng, Jaw-Shen Tsai, Zhirong Lin

Year

2026

Paper ID

45533

Status

Preprint

Abstract Read

~2 min

Abstract Words

102

Citations

N/A

Abstract

The development of large-scale superconducting quantum computing requires efficient in-situ control methods that allow high-fidelity operations at millikelvin temperatures. Superconducting circuits based on Josephson junctions offer a promising solution due to their high speed, low power dissipation, and cryogenic nature. Here, we report a superconducting quantum controller that enables direct chip-to-chip interconnection with qubits at 10 mK and high-fidelity, all-digital manipulation. Randomized benchmarking reveals a uniformly high average Clifford fidelity of 99.9% with leakage to high energy levels on the order of 10^-4, and an estimated average gate operation energy of 0.121 fJ, demonstrating the potential to resolve the control bottleneck in superconducting quantum computing.

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The development of large-scale superconducting quantum computing requires efficient in-situ control methods that allow high-fidelity operations at millikelvin temperatures.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2604.05693 [2] arXiv https://arxiv.org/abs/2604.05693 [3] Publisher https://arxiv.org/abs/2604.05693

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