通过辅助发射极线宽压缩突破坏腔极限
Beating the Bad-Cavity Limit via Auxiliary-Emitter Linewidth Squeezing
AI总结：
该研究在坏腔中引入两个失谐相反的非全同辅助发射极，通过亚辐射模式压缩有效腔线宽，使裸腔处于弱耦合时目标发射极仍实现强耦合，为量子计算等应用提供新平台。
AI中文摘要：
腔量子电动力学（QED）中的强耦合通常以牺牲高腔品质因子或超小模式体积为代价，这种权衡从根本上限制了实际应用。本文通过在坏腔中引入两个失谐相反的非全同辅助发射极来规避该限制，该混合系统支持亚辐射模式，可显著压缩有效腔线宽，在腔频率处形成超窄透射窗口。结果表明，置于该工程环境中的目标发射极展现出延长的真空拉比振荡和可分辨的自发发射分裂，这些是强耦合的明确特征，即便裸腔仍处于弱耦合区域。该方案因此将坏腔转化为强耦合物理的有效平台，在量子计算和量子传感领域具有潜在应用。
英文摘要：
Strong coupling in cavity QED is conventionally achieved at the expense of either high cavity quality factors or ultrasmall mode volumes, a trade-off that fundamentally constrains practical implementations. Here, we circumvent this limitation by introducing two nonidentical auxiliary emitters with opposite detunings into a bad cavity. This hybrid system supports a subradiant mode that significantly squeeze the effective cavity linewidth, creating an ultra-narrow transmission window at the cavity frequency. As a result, a target emitter placed in this engineered environment exhibits prolonged vacuum Rabi oscillations and resolved spontaneous emission splitting, which are clear signatures of strong coupling, even though the bare cavity remains in the weak-coupling regime. Our scheme thus transforms a bad cavity into an effective platform for strong-coupling physics, with potential applications in quantum computation and quantum sensing.
