激发态Yb$^+$的次赫兹光学跃迁
Sub-hertz optical transitions in excited Yb$^+$
AI总结：
研究通过观测Yb$^+$激发态的次赫兹光学跃迁，揭示其在量子信息和新物理探索中的潜在应用价值。
摘要：
我们报道了从基态$^{2}\mathrm{F}^o_{7/2}$态中观察到三个半禁戒跃迁。由于参与跃迁的上、下能级寿命较长，这些跃迁较窄，补充了该原子中已频繁用于量子信息和新物理搜索的跃迁。我们报告了这些电四极跃迁的绝对频率、同位移移、超精细结构以及四极跃迁矩的测量。我们发现这些激发态的自发寿命受限于慢磁偶极发射到较低的奇宇称态，其中最低的可通过激光激发从${}^2\mathrm{F}_{7/2}^o$态到达，并是一个具有长寿命量子比特的有吸引力候选者。
英文摘要：
We present the observation of three semi-forbidden transitions in singly-ionized ytterbium from the metastable $^{2}\mathrm{F}^o_{7/2}$ state. Owing to the long lifetimes of both the upper and lower states involved, these transitions are narrow and complement those already frequently used in this atom for quantum information and searches for new physics. We report the absolute frequencies of these electric quadrupole transitions, their isotope shifts, hyperfine structure, and measurements of the quadrupole transition moments. We find that the spontaneous lifetimes of these excited states are limited by slow magnetic dipole emission to lower-lying, odd-parity states, the lowest of which is accessible by laser excitation from ${}^2\mathrm{F}_{7/2}^o$ and is an attractive candidate for hosting a long-lived qubit.
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