具有亚寿命限制线宽的相干辅助共振
Coherence assisted resonance with sub-lifetime-limited linewidth
摘要：
我们展示了一种新的方法来获得共振线宽低于相干寿命的限制。耦合目标共振的两束激光的感应强度调制之间的互相关表现出窄谱。在两个基态为目标共振能级的原理验证实验中实现了寿命限制宽度的1/30。理论上，激光器的线宽只受激光散粒噪声的限制。实验结果与直观的分析模型和数值计算定性一致。该技术可以容易地实现，并且应该适用于许多原子、分子和固态自旋系统，用于光谱学、计量学和基于共振的感测和成像。
英文摘要：
We demonstrate a novel approach to obtain resonance linewidth below that limited by coherence lifetime. Cross correlation between induced intensity modulation of two lasers coupling the target resonance exhibits a narrow spectrum. 1/30 of the lifetime-limited width was achieved in a proof-of-principle experiment where two ground states are the target resonance levels. Attainable linewidth is only limited by laser shot noise in principle. Experimental results agree with an intuitive analytical model and numerical calculations qualitatively. This technique can be easily implemented and should be applicable to many atomic, molecular and solid state spin systems for spectroscopy, metrology and resonance based sensing and imaging.
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