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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Progress of the dual-traps microwave frequency standard based on 113Cd+ ions

Yani Zuo, K. Miao, Changjun Gao, Jianwei Zhang, L. J. Wang

Published May 1, 2016• 1 citation
Publisher

Abstract

Microwave frequency standards based on ions have made great progress over the past decades; a microwave atomic clock based on laser cooled113Cd+ions at Tsinghua University is carried out for about five years. In order to further improve the performance of the clock, a new experiment setup with dual traps and two kinds of ions was proposed. This paper reports our recent experimental progress of the new dual-traps microwave frequency standard based on113Cd+ions.

DOI
10.1109/fcs.2016.7546755

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European Frequency and Time Forum•Apr 1, 2012•0 citations
Microwave frequency standards based on ions have made great progress over the past decades; a microwave atomic clock based on laser cooled113Cd+ions at Tsinghua University is carried out for about five years. In order to further improve the performance of the clock, a new experiment setup with dual traps and two kinds of ions was proposed. This paper reports our recent experimental progress of the new dual-traps microwave frequency standard based on113Cd+ions.
Microwave frequency standards based on ions are promising as the next generation atomic clocks. This paper reports the recent progresses of the microwave frequency standard based on laser-cooled113Cd+ions developed at Tsinghua University. Based on the current experimental setup, the ground-state hyperfine splitting of113Cd+is measured with higher precision and a better short-term frequency stability is obtained than before. To improve the performance of the Cd+clock further, a new experimental setup with dual-traps is designed, and bi-ions operation is proposed.
Abstract As a candidate for the next generation microwave clock, microwave atomic clocks based on trapped ions are currently studied worldwide. Since 2010, our team at Tsinghua University has been committed to developing a high-performance 113Cd+ microwave ion clock. In 2021, the laser-cooled cadmium-ion microwave clock constructed in our laboratory demonstrated remarkable performance, with a short-term instability of 4.2 × 10 − 13 / τ and a relative frequency uncertainty of 1.8 × 10−14, improving nearly three orders of magnitude compared to the result from JPL. The 0-0 ground-state hyperfine splitting frequency of 113Cd+ was determined to be 15199862855.02799(27) Hz, currently the most accurate measurement result for this transition frequency. Apart from that, we introduced the sympathetic cooling technology into the experiment of cadmium-ion microwave clock. Using 40Ca+ as the coolant ion, we obtained Ramsey patterns with a free evolution time of up to 100 seconds, ultimately improving the short-term instability of the system to 3.48 × 10 − 13 / τ . Moreover, a microwave frequency standard based on laser-cooled 171Yb+ ions has also been developed in our laboratory since 2021. The short-term frequency instability was measured to be 8.5 × 10 − 13 / τ . The ground-state hyperfine splitting frequency of 171Yb+ was determined to be 12642812118.4674(8) Hz with a fractional frequency uncertainty of 6.33 × 10−14.