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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.15100 |
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| _version_ | 1866914046055284736 |
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| author | Liu, Xiao-Yong Liu, Peng Li, Jie Zhang, Yu-Chen Wang, Yuan-Bo Jia, Zhi-Peng Zhang, Xiang Zhu, Xian-Qing Kong, De-Quan Song, Wen-Lan Niu, Guo-Zhen Yang, Yu-Meng Feng, Pei-Jun Liu, Xiang-Pei Cui, Xing-Yang Xu, Ping Jiang, Xiao Yin, Juan Liao, Sheng-Kai Peng, Cheng-Zhi Dai, Han-Ning Chen, Yu-Ao Pan, Jian-Wei |
| author_facet | Liu, Xiao-Yong Liu, Peng Li, Jie Zhang, Yu-Chen Wang, Yuan-Bo Jia, Zhi-Peng Zhang, Xiang Zhu, Xian-Qing Kong, De-Quan Song, Wen-Lan Niu, Guo-Zhen Yang, Yu-Meng Feng, Pei-Jun Liu, Xiang-Pei Cui, Xing-Yang Xu, Ping Jiang, Xiao Yin, Juan Liao, Sheng-Kai Peng, Cheng-Zhi Dai, Han-Ning Chen, Yu-Ao Pan, Jian-Wei |
| contents | Optical atomic clocks play a crucial role in fundamental physics, relativistic geodesy, and the future redefinition of the SI second. Standard operation relies on cyclic interrogation sequences, which alternate between atomic interrogation and dead time used for state preparation and readout. This approach introduces the Dick effect, where laser frequency noise aliases onto the atomic transition frequency. Although reducing laser noise improves clock stability, the Dick effect remains a key limitation. In this work, we demonstrate a zero-dead-time optical clock based on two interleaved ensembles of cold $^{87}\text{Sr}$ atoms. Our system significantly suppresses this noise and achieves a fractional frequency instability at the $10^{-19}$ level between 10,000 and 20,000 seconds over repeated measurements, with a best value of $2.9 \times 10^{-19}$ at $τ= 20,000$ seconds. The estimated long-term stability based on the combined data of these measurements reaches $2.5 \times 10^{-19}$ at one day. These results represent a more than ninefold improvement over a conventional single-ensemble clock, highlighting its potential for next-generation timekeeping applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15100 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A zero-dead-time strontium lattice clock with a stability at $10^{-19}$ level Liu, Xiao-Yong Liu, Peng Li, Jie Zhang, Yu-Chen Wang, Yuan-Bo Jia, Zhi-Peng Zhang, Xiang Zhu, Xian-Qing Kong, De-Quan Song, Wen-Lan Niu, Guo-Zhen Yang, Yu-Meng Feng, Pei-Jun Liu, Xiang-Pei Cui, Xing-Yang Xu, Ping Jiang, Xiao Yin, Juan Liao, Sheng-Kai Peng, Cheng-Zhi Dai, Han-Ning Chen, Yu-Ao Pan, Jian-Wei Atomic Physics Optical atomic clocks play a crucial role in fundamental physics, relativistic geodesy, and the future redefinition of the SI second. Standard operation relies on cyclic interrogation sequences, which alternate between atomic interrogation and dead time used for state preparation and readout. This approach introduces the Dick effect, where laser frequency noise aliases onto the atomic transition frequency. Although reducing laser noise improves clock stability, the Dick effect remains a key limitation. In this work, we demonstrate a zero-dead-time optical clock based on two interleaved ensembles of cold $^{87}\text{Sr}$ atoms. Our system significantly suppresses this noise and achieves a fractional frequency instability at the $10^{-19}$ level between 10,000 and 20,000 seconds over repeated measurements, with a best value of $2.9 \times 10^{-19}$ at $τ= 20,000$ seconds. The estimated long-term stability based on the combined data of these measurements reaches $2.5 \times 10^{-19}$ at one day. These results represent a more than ninefold improvement over a conventional single-ensemble clock, highlighting its potential for next-generation timekeeping applications. |
| title | A zero-dead-time strontium lattice clock with a stability at $10^{-19}$ level |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2509.15100 |