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In this papar we reported our progress toward chip-scale atomic clock (CPT) based on the 87Rb coherent population trapping (CPT) transition. During last year, we did great work in improving the performance of our CSAC, especially in frequency drift and long-term frequency stability. It is a remarkable achievement that the amplitude of the drift is around 7.0×10−12/day and long-term stability is around...
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