Non-Hermitian systems with parity–time (PT)-symmetry have been extensively studied and rapidly developed in resonance wireless power transfer (WPT). The WPT system that satisfies PT-symmetry always has real eigenvalues, which promote efficient energy transfer. However, meeting the condition of PT-symmetry is one of the most puzzling issues. Stable power transfer under different transmission conditions is also a great challenge. Bound state in the continuum (BIC) supporting extreme quality-factor mode provides an opportunity for efficient WPT. Here, we propose theoretically and demonstrate experimentally that BIC widely exists in resonance-coupled systems without PT-symmetry, and it can even realize more stable and efficient power transfer than PT-symmetric systems. Importantly, BIC for efficient WPT is universal and suitable in standard second-order and even high-order WPT systems. Our results not only extend non-Hermitian physics beyond PT-symmetry, but also bridge the gap between BIC and practical application engineering, such as highperformance WPT, wireless sensing and communications.

具有宇称时间（PT）对称性的非厄米系统在谐振无线电力传输（WPT）领域得到了广泛研究和快速发展。满足PT对称性的WPT系统始终具有实数特征值，从而促进有效的能量传递。然而，满足PT对称性的条件是最令人困惑的问题之一。不同传输条件下的稳定电力传输也是一个巨大的挑战。支持极端品质因数模式的连续束缚态 (BIC) 为高效 WPT 提供了机会。在这里，我们从理论上提出并通过实验证明，BIC广泛存在于不具有PT对称性的谐振耦合系统中，甚至可以实现比PT对称系统更稳定、更高效的功率传输。重要的是，高效WPT的BIC是通用的，适用于标准二阶甚至高阶WPT系统。我们的研究结果不仅将非厄米物理学扩展到 PT 对称之外，而且弥合了 BIC 与实际应用工程（例如高性能 WPT、无线传感和通信）之间的差距。