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.
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
