The emitter-cavity strong coupling manifests crucial significance for exploiting quantum technology, especially in the scale of individual emitters. However, due to the small light-matter interaction cross-section, the single emitter-cavity strong coupling has been limited by its harsh requirement on the quality factor of the cavity and the local density of optical states. Herein, we present a strategy termed waveguide-assisted energy quantum transfer (WEQT) to improve the single emitter-cavity coupling strength by extending the interaction cross-section. Multiple ancillary emitters are optically linked by a waveguide, providing an indirect coupling channel to transfer the energy quantum between target emitter and cavity. An enhancement factor of coupling strength \(\widetilde{g}/g > 10\) can be easily achieved, which dramatically release the rigorous design of cavity. As an extension of concept, we further show that the ancillae can be used as controlling bits for a photon gate, opening up new degrees of freedom in quantum manipulation.

发射极-腔强耦合对于开发量子技术具有至关重要的意义，特别是在单个发射极的规模上。然而，由于光与物质相互作用截面较小，单发射器-腔强耦合因其对腔品质因数和光学态局域密度的苛刻要求而受到限制。在此，我们提出了一种称为波导辅助能量量子转移（WEQT）的策略，通过扩展相互作用截面来提高单发射极-腔耦合强度。多个辅助发射器通过波导进行光学连接，提供间接耦合通道以在目标发射器和腔体之间传输能量量子。可以轻松实现耦合强度的增强因子\(\widetilde{g}/g > 10\) ，极大地释放了腔体的严格设计。作为概念的扩展，我们进一步证明辅助装置可以用作光子门的控制位，从而在量子操纵中开辟新的自由度。