Improvement of Stability of ^40Ca^＋ Optical Clock with State Preparation  

作　　者：曾孟彦 黄垚 邵虎 王淼 张华青 张宝林 管桦 高克林 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 [2]Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 [3]Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071 [4]University of Chinese Academy of Sciences, Beijing 100049

出　　处：《Chinese Physics Letters》2018年第7期37-40,共4页中国物理快报（英文版）

基　　金：Supported by the National Key R&D Program of China under Grant No 2017YFA0304401;the National Natural Science Foundation of China under Grant Nos 91336211,11634013,11474318 and 11622434;the Strategic Priority Research Program B of Chinese Academy of Sciences under Grant No XDB21030100;the Hubei Provincial Science Fund for Distinguished Young Scholars under Grant No 2017CFA040;the Youth Innovation Promotion Association of Chinese Academy of Sciences under Grant No2015274

摘　　要：Stability is one of most important performances of an atomic clock. Here we describe our recent work on improving the stability of our ^40Ca^＋ optical clock. State preparation is adopted to transfer the ion to the groundstate magnetic sublevel of the clock transition, after the quenching laser transfers the ion to the ground state at each cycle. Using this method,the stability for ^40Ca^＋ optical clock is improved to about 6.3 × 10^-15/√τ.Compared with 1.0 × 10^-14/√τ in previous work, the averaging time is decreased to reach a given level of statistical uncertainty in a clock comparison.Stability is one of most important performances of an atomic clock. Here we describe our recent work on improving the stability of our ^40Ca^＋ optical clock. State preparation is adopted to transfer the ion to the groundstate magnetic sublevel of the clock transition, after the quenching laser transfers the ion to the ground state at each cycle. Using this method,the stability for ^40Ca^＋ optical clock is improved to about 6.3 × 10^-15/√τ.Compared with 1.0 × 10^-14/√τ in previous work, the averaging time is decreased to reach a given level of statistical uncertainty in a clock comparison.

分 类 号：TM935.115[电气工程—电力电子与电力传动]