论文标题
用花岗岩光谱仪对弹跳中子的重力量子状态操纵
Manipulation of gravitational quantum states of a bouncing neutron with the GRANIT spectrometer
论文作者
论文摘要
弹跳中子是可以在量子框架中研究重力的罕见系统之一。为此，至关重要的是能够选择一些特定的重力量子态（GQ）。 GRANIT设备是连接到超热UCN源的第一个物理实验。我们报告了为该仪器开发的方法，显示了如何使用镜子和吸收缝隙之间的一步来偏爱特定的GQ。我们通过增加吸收器粗糙度振幅来探索GQS分离效率的提高，并发现它是可行的，但需要高调节精度。我们还量化了吸收缝隙的传输，从而导致中子垂直波函数的空间延伸$ z_0 = \ hbar^{2/3} \ left（2m^2g \ right）
The bouncing neutron is one of the rare system where gravity can be studied in a quantum framework. To this end it is crucial to be able to select some specific gravitational quantum state (GQS). The GRANIT apparatus is the first physics experiment connected to a superthermal helium UCN source. We report on the methods developed for this instrument showing how specific GQS can be favored using a step between mirrors and an absorbing slit. We explore the increase of GQS separation efficiency by increasing the absorber roughness amplitude, and find it is feasible but requires a high adjustment precision. We also quantify the transmission of the absorbing slit leading to a measurement of the spatial extension of the neutron vertical wave function $z_0 = \hbar^{2/3}\left(2m^2g\right)^{-1/3} = 5.9\pm0.3\,μ$m.
