Testing fundamental physics with ultracold molecules

超冷分子可以用来测量电子的电偶极矩（eEDM）和测量电子-质子质量比的稳定性。这些测量使用了量子技术的最新进展，以寻找超越标准模型的新物理。该项目的目的是利用捕获在光学晶格中的分子来测量eEDM。这项工作将从激光冷却和磁光捕获所需分子开始。然后这些将被转移到一个光学晶格中，并被传输到一个磁屏蔽装置中。在这里，分子自旋将通过受激拉曼绝热通道制备，然后在强电场的存在下进行进动。电场诱导的自旋进动频率决定了eEDM，可以通过将自旋角度映射到分子的超精细水平上，然后读出这些水平上的居群来测量。

Ultracold molecules can be used to measure the electron's electric dipole moment (eEDM) and to measure the stability of the electron-to-proton mass ratio. These measurements use the latest advances in quantum technology in order to search for new physics that goes beyond the Standard Model. The aim of the project is to measure the eEDM using molecules trapped in an optical lattice. The work will begin by laser cooling and magneto-optical trapping of the desired molecules. These will then be transferred to an optical lattice and transported into a magnetically shielded apparatus. Here, the molecular spin will be prepared by stimulated Raman adiabatic passage, then allowed to precess in the presence of a strong electric field. The electric-field-induced spin precession frequency determines the eEDM and can be measured by mapping the angle of the spin onto the hyperfine levels of the molecules and then reading out the populations in those levels.