High-precision measurement of level leakage via intelligent coherent control

arXiv:2611.15031v1 Announce Type: new Abstract: Level leakage constitutes a dominant error source in quantum state control and necessitates accurate characterization for large-scale quantum computing. Quantum sensing provides a viable route for high-precision estimation of level leakage, but its sensitivity can be limited by non-unitary leakage dynamics and interference between the free Hamiltonian and signal generator. This work proposes a reinforcement learning-based quantum sensing algorithm for Hermitian three-level and effective dissipative two-level systems. The algorithm adopts an experimentally feasible pulse-parameter modulation strategy, enabling high-precision and reliable measurement under the specified control and measurement protocol.