Recent progress on the 27Al+ ion optical clock

8th Symposium on Frequency Standards and Metrology 2015

Xu, Z.T.^1 ; Yuan, W.H.^1 ; Zeng, X.Y.^1 ; Che, H.^1 ; Shi, X.H.^1 ; Deng, K.^1 ; Zhang, J.^1 ; Lu, Z.H.^1

MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan

430074, China^1

关键词: Beat frequency;    Clock transition;    Optical clocks;    Quantum logic;    Raman sidebands;    Recent progress;    Science and Technology;    Ultra-stable lasers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/723/1/012026/pdf
DOI  :  10.1088/1742-6596/723/1/012026

来源: IOP

【 摘 要 】

An aluminium ion optical clock is under development at Huazhong University of Science and Technology. The25Mg+ion is chosen as logic ion to sympathetically cool an Al+ion and to detect its states. The25Mg+ion is cooled to the motional ground state through Raman sideband cooling as the first step for quantum logic spectroscopy. Ultra-stable lasers for the interrogation of the clock transition are developed. The instability of the laser beat frequency is 1.2 x 10-15at 1 s, which is close to the thermal noise limit of the reference cavity.