发表机构
Graduate School of Advanced Science and Engineering, Hiroshima University（广岛大学先进理工学研究科）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过后选择方法将Fisher信息集中于低概率输出端口，利用圆偏振转移相位灵敏度，在双路径干涉仪中实现了相当于四光子NOON态的相位梯度，超越了标准量子极限。
AI 中文摘要
后选择计量学通过将所有可用的Fisher信息集中在后选择结果的一个子集中，可以超越单光子干涉的标准量子极限。这里我们将这一原理应用于标准的双路径干涉仪，通过将相位灵敏度转移到光子的圆偏振上，激活集中在低概率输出端口的Fisher信息。我们获得了后选择干涉条纹的相位梯度，该梯度对应于四光子NOON态的相位梯度，从而为多光子干涉与单光子后选择的性能提供了直接比较。
英文摘要
Post-selected metrology can exceed the standard quantum limit of single photon interference by concentrating all of the available Fisher information in a subset of post-selected outcomes. Here we apply this principle to a standard two-path interferometer, activating the Fisher information concentrated in the low probability output port by transferring the phase sensitivity to the circular polarizations of the photon. We obtain a phase gradient of the post-selected interference fringe that corresponds to that of a four-photon NOON state, providing a direct comparison of the performance of multi-photon interference with single-photon post-selection.
