Abstract
A microwave frequency standard based on <sup>113</sup>Cd<sup>+</sup> ions at Tsinghua University has been carried out for twelve years. To overcome the limitations of the Dick effect and the second-order Doppler frequency shift (SODFS), we propose to use heavy <sup>174</sup>Yb<sup>+</sup> as the coolant ions to sympathetically cool the large <sup>113</sup>Cd<sup>+</sup> cloud, which is expected to further improve the performance of the cadmium-ion microwave frequency standard. This paper reports our recent experimental and simulation progress towards the cadmium-ion microwave frequency standard.
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