标题： 相干光通过多光子干涉减少不确定性积 显示英文标题

标题： Reducing of the Uncertainty Product of Coherent Light through Multi-Photon Interference

摘要： 我们从理论上和实验上证明了如何通过多光子干涉克服单模相干连续波激光光的衍射和干涉分辨率限制。 通过使用迈克尔逊干涉仪，在单输入和单个或两个输出端口几何结构下运行，我们观察到传统干涉图样的条纹宽度减小，根据波动或单光子量子理论预测，通过最多$1/\sqrt{2N}$次同时检测$N=2,3,4$光子，条纹宽度可以减少一个因子。 我们的方案不需要压缩光或纠缠光来克服标准量子极限，并极大地促进了精密干涉测量实验。 显示英文摘要

摘要： We demonstrate theoretically and experimentally how the diffraction and interferometric resolution limit for single-mode coherent cw laser light can be overcome by multi-photon interference. By use of a Mach-Zehnder interferometer, operated in the single input and single or double output port geometries, we observe a fringe width reduction of the conventional interference pattern, predicted by the wave or single photon quantum theory, by a factor of up to $1/\sqrt{2N}$ through coincident detection of $N=2,3,4$ photons. Our scheme does not require squeezed or entangled light to overcome the standard quantum limit and greatly facilitates precision interferometry experiments.