USTC's Zuchongzhi 3.2 Achieves Below-Threshold Quantum Error Correction

Researchers at the University of Science and Technology of China (USTC) have achieved a significant milestone with their Zuchongzhi 3.2 processor, demonstrating quantum error correction (QEC) below the surface code threshold.

This breakthrough, published in Physical Review Letters, shows that error rates decrease as code size increases, a crucial step towards scalable, fault-tolerant superconducting quantum systems. The all-microwave leakage suppression architecture used in this research helps mitigate correlated errors without complex hardware, narrowing the gap with global leaders in quantum computing.