Efficient and precise measurement of electromagnetic signals is critical for both fundamental science and practical applications, yet traditional techniques often face inherent constraints in multi-parameter optimization. Here, the authors experimentally realize a quantum demodulator using two heteronuclear ions, achieving inverse-quartic and inverse-quadratic temporal scaling for frequency and amplitude estimation, respectively, thereby highlighting the power of reinforcement learning in advancing quantum sensing technologies.
- Jiawei Zhang
- Wenqiang Ding
- Mang Feng