标题： 通过失焦进行中子干涉仪中的相干性优化 显示英文标题

标题： Coherence Optimization in Neutron Interferometry through Defocussing

摘要： 一个零面积四叶片完美晶体中子干涉仪（NI）对于低频机械振动具有退相干自由子空间（DFS），因此更容易安装。 具有将基于晶体的中子干涉仪应用扩展到更多中子源的潜力。 然而，与标准的三叶片马赫-泽德曼 NI 不同，这种四叶片 NI 几何结构的理想对比度小于一。 通过应用一种最近引入的动力学衍射量子信息模型，我们表明可以通过偏移聚焦条件来提高四叶片 DFS NI 的对比度。 对比度优化导致了一种叶片中心之间距离相等的 NI 几何结构。 提出了一项实验来验证对比度的增加。 显示英文摘要

摘要： A zero-area four-blade perfect crystal neutron interferometer (NI) possess a decoherence-free subspace (DFS) for low-frequency mechanical vibrations and thus is easier to site. %has the potential to broaden the application of crystal-based neutron interferometry to a higher number of neutron sources. However, unlike the standard three-blade Mach-Zehnder NI the ideal contrast of this four-blade NI geometry is less than one. By applying a recently introduced quantum information model for dynamical diffraction we show that the contrast for the four-blade DFS NI can be increased by offsetting the focusing condition. The contrast optimization leads to an NI geometry where the distances between the centers of the blades are equidistant. An experiment is proposed to verify the increase in contrast.