Frequency-Detuning Enabled High-Order Non-Hermitian Physics for Robust Wireless Power Transfer

Parity–time (PT)-symmetry has enabled efficient wireless power transfer (WPT), yet its practical deployment is hindered by the requirement of balanced gain–loss configurations and nonlinear circuit elements. Here, we propose a frequency-detuning strategy in high-order non-Hermitian systems to achieve robust and efficient WPT without PT-symmetry. Specifically, an asymmetric third-order resonant architecture is designed, in which controlled detuning maintains purely real eigenvalues even under strong coupling asymmetry and extended transfer distances. This mechanism is physically equivalent to dynamical impedance matching, providing a universal interpretation of high-efficiency energy delivery. Theoretical analysis shows that detuning serves as an additional and flexible control degree of freedom, enabling stable operation beyond the exceptional-point-determined strong-coupling regime. Experimental measurements validate the proposed scheme and demonstrate a clear performance advantage over conventional second-order resonant WPT, particularly in the weak-coupling regime that dominates long-range operation. Notably, under weak coupling at a transfer distance of 18 cm, the proposed system achieves a 3.63-fold efficiency enhancement compared with conventional designs. These results establish frequency detuning as an effective and scalable approach for non-Hermitian WPT, bridging fundamental physics with application-oriented wireless energy delivery.