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A compact, transportable single-ion optical clock with 7.8 × 10−17 systematic uncertainty

2017; Springer Science+Business Media; Volume: 123; Issue: 4 Linguagem: Inglês

10.1007/s00340-017-6671-5

1432-0649

Jian Cao, P. Zhang, Jianhua Shang, Kaifeng Cui, J. Yuan, Sijia Chao, S. Wang, Hualin Shu, Xueqin Huang,

Cardiovascular Syncope and Autonomic Disorders

A transportable optical clock refer to the $4s^2S_{1/2}-3d^2D_{5/2}$ electric quadrupole transition at 729 nm of single $^{40}Ca^+$ trapped in mini Paul trap has been developed. The physical system of $^{40}Ca^+$ optical clock is re-engineered from a bulky and complex setup to an integration of two subsystems: a compact single ion unit including ion trapping and detection modules, and a compact laser unit including laser sources, beam distributor and frequency reference modules. Apart from the electronics, the whole equipment has been constructed within a volume of 0.54 $m^3$. The systematic fractional uncertainty has been evaluated to be $7.7\times 10^{-17}$, and the Allan deviation fits to be $2.3\times {10}^{-14}/\sqrtτ$ by clock self-comparison with a probe pulse time 20 ms.