Plans for laser spectroscopy of trapped cold hydrogen-like HCI

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

Hyperfine-structures of highly charged ions (HCIs) are favourable spectroscopic targets for exploring fundamental physics as well as nuclear properties. Recent proposals of HCI atomic clocks highlight their importance, especially for many-electron HCIs, and they have been theoretically investigated by refining atomic-structure calculations. Nonetheless, no established spectroscopic method is currently available to verify these theoretical calculations. Here, we demonstrate hyperfine-structure-resolved laser spectroscopy of HCIs in an electron beam ion trap plasma, employing the magnetic-dipole…

利用陷阱中反质子诱导的核碎裂合成冷且可俘获的完全剥离 HCI

Synthesis of cold and trappable fully stripped HCI's via antiproton-induced nuclear fragmentation in traps

针对传统放射性同位素与高电荷离子产生分离步骤漫长且限制可研究物种的问题，提出一种在陷阱环境中直接形成完全或几乎完全剥离放射性核的新方案，扩展了可研究物种范围并补充了现有技术。

具有超导磁屏蔽的射频阱中的冷高电荷态离子

Cold highly charged ions in a radio-frequency trap with superconducting magnetic shielding

本研究通过超导射频阱实现高电荷态离子的协同冷却，利用Be+离子验证了极低磁场衰减和长相干时间，为量子逻辑光谱学与频率计量奠定基础。

Coherent laser spectroscopy of highly charged ions using quantum logic

Precision spectroscopy of atomic systems is an invaluable tool for the advancement of our understanding of fundamental interactions and symmetries. Recently, highly charged ions (HCI) have been proposed for sensitive tests of physics beyond the Standard Model and as candidates for high-accuracy atomic clocks. However, the implementation of these ideas has been hindered by the parts-per-million level spectroscopic accuracies achieved to date. Here, we cool a trapped HCI to the lowest reported temperatures, and introduce coherent laser spectroscopy on HCI with an eight orders of magnitude leap i…

Near ground-state cooling of two-dimensional trapped-ion crystals with more than 100 ions

We study, both experimentally and theoretically, electromagnetically induced transparency cooling of the drumhead modes of planar 2-dimensional arrays with up to $N\approx 190$ Be${}^+$ ions stored in a Penning trap. Substantial sub-Doppler cooling is observed for all $N$ drumhead modes. Quantitative measurements for the center-of-mass mode show near ground state cooling with motional quantum numbers of $\bar{n} = 0.3\pm0.2$ obtained within $200~μs$. The measured cooling rate is faster than that predicted by single particle theory, consistent with a quantum many-body calculation. For the lower…

Rydberg excitation of trapped cold ions: A detailed case study

We provide a detailed theoretical and conceptual study of a planned experiment to excite Rydberg states of ions trapped in a Paul trap. The ultimate goal is to exploit the strong state dependent interactions between Rydberg ions to implement quantum information processing protocols and to simulate the dynamics of strongly interacting spin systems. We highlight the promises of this approach when combining the high degree of control and readout of quantum states in trapped ion crystals with the novel and fast gate schemes based on interacting giant Rydberg atomic dipole moments. We discuss antic…