Multi-Ion Precision Spectroscopy

该项目旨在解决在射频阱中捕获的单个和群系离子中高度禁止的光学跃迁的超高精度光谱问题。在该项目的框架内，计划开发和实验测试离子库仑晶体的新光谱方法，这将允许从根本上抑制探针场引起的光移。在开发合成频率方法的框架内，旨在显著降低多离子系统的黑体辐射位移及其对环境温度波动的敏感性。为了解决由于库仑晶体热动力学引起的多普勒频移，将在耦合多体系统中开发和测试先进的冷却技术。在双方的共同努力下，将对激光冷却库仑晶体中的原子频率进行首次高精度光谱测量，并以PTB的锶晶格时钟为基准。开发的激光冷却离子链精密光谱学工具将对基础物理的改进测试非常重要，例如局部洛伦兹不变性和广义相对论的测试，以及对标准模型之外的物理的探索。

The project is aimed at solving the problem of ultra-high precision spectroscopy of highly forbidden optical transitions in single and in ensembles of ions trapped in a radio frequency trap. Within the framework of the project, it is planned to develop and experimentally test new spectroscopic methods for ion Coulomb crystals, which will allow to radically suppress the light shift induced by probe fields. Within the frame of development of the synthetic frequency method, it is intended to achieve a significant decrease in the black-body radiation shift for multi-ion systems and their sensitivity to fluctuations in ambient temperature. In order to tackle Doppler-shifts due to the thermal dynamics in the Coulomb crystal, advanced cooling techniques will be developed and tested in coupled many-body systems. A first high-precision spectroscopy measurement of atomic frequencies in a laser-cooled Coulomb crystal will be carried out in a joint effort and benchmarked against PTB’s strontium lattice clock. The developed tools for precision spectroscopy in laser-cooled chains of ions will be important for improved tests of fundamental physics, such as tests of Local Lorentz Invariance and General Relativity and the search for physics beyond the Standard Model.