Fault-Tolerant Quantum Error Correction for Constant-Excitation Stabilizer Codes under Coherent Noise
This work develops a complete fault-tolerant framework for Constant-Excitation (CE) stabilizer codes to resist collective coherent noise, which is a type of error outside standard models. The research introduces specialized logical gates and syndrome extraction circuits that are compatible with CE constraints, showing these codes can achieve an estimated fault-tolerant threshold of about 0.02% for the [[12, 1, 3]] code.