USTC’s Zuchongzhi 3.2 Achieves Below-Threshold QEC Milestone

Researchers at the University of Science and Technology of China (USTC) have demonstrated fault-tolerant quantum error correction (QEC) below the surface code threshold using the 107-qubit Zuchongzhi 3.2 superconducting processor. Published as an Editors’ Suggestion in Physical Review Letters on December 22, 2025, the study confirms that logical error rates suppress exponentially as code size […]

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