USTC Demonstrates Autonomous Trapped-Ion QEC, Logical Qubit Lasts 11.7 ms
jiqizhixin · x · 2026-11-16
A University of Science and Technology of China team reports in Nature Physics an autonomous trapped-ion error-correction experiment protecting quantum information beyond the best physical qubit in the same system.
- Bottleneck: encoding alone doesn't extend lifetime; repeated correction must remove errors faster than extra operations create them.
- Mechanism: four internal levels of one calcium ion encode a logical qubit; laser control moves error-related entropy into a shared vibrational mode, and cooling a second ion resets it for the next cycle—no repeated syndrome measurement or real-time feedback needed.
- Result: under deliberately injected low-frequency magnetic noise, the corrected logical qubit lasts 11.7 milliseconds.
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