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<p>Optical clocks have extremely attractive applications in many fields, including time–frequency metrology, validation of fundamental physical principles, and relativistic geodesy. The 467&#xa0;nm octupole transition in <sup>171</sup>Yb<sup>+</sup> ion exhibits intrinsic insensitivity to magnetic field and an ultra-long clock state lifetime of 1.6&#xa0;years. In addition, the entire laser system can be realized by semiconductor technologies, rendering this platform uniquely advantageous for developing high-precision, compact and transportable optical clocks. Here, we report the development of a compact optical clock based on the 467&#xa0;nm transition of a single <sup>171</sup>Yb<sup>+</sup> ion. Using a narrow linewidth 467&#xa0;nm laser to interrogate the clock transition, we obtain a near-Fourier-limited linewidth of 2.3&#xa0;Hz in an integrated ion trapping system. Self-comparison demonstrated a frequency instability of 2.2 × 10<sup>−15</sup>/<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sqrt{\uptau /\text{s}}\)</EquationSource> </InlineEquation> with an interrogation time of 180&#xa0;ms, which reaches the high parts in 10<sup>−18</sup> level with an averaging time of only 1&#xa0;day. These work laid the technical foundation for the subsequent clock systematic evaluation and the packaging of each subsystem into an engineering prototype with high-precision at the level of 10<sup>−18</sup>.</p>

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Towards a compact transportable optical clock based on the octupole transition in 171Yb+

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Xuanjian Wang,
  • Jian Cao,
  • Hualin Shu,
  • Yi Yuan,
  • Zehao Li,
  • Pengcheng Fang,
  • Qunfeng Chen,
  • Xueren Huang

摘要

Optical clocks have extremely attractive applications in many fields, including time–frequency metrology, validation of fundamental physical principles, and relativistic geodesy. The 467 nm octupole transition in 171Yb+ ion exhibits intrinsic insensitivity to magnetic field and an ultra-long clock state lifetime of 1.6 years. In addition, the entire laser system can be realized by semiconductor technologies, rendering this platform uniquely advantageous for developing high-precision, compact and transportable optical clocks. Here, we report the development of a compact optical clock based on the 467 nm transition of a single 171Yb+ ion. Using a narrow linewidth 467 nm laser to interrogate the clock transition, we obtain a near-Fourier-limited linewidth of 2.3 Hz in an integrated ion trapping system. Self-comparison demonstrated a frequency instability of 2.2 × 10−15/ \(\sqrt{\uptau /\text{s}}\) with an interrogation time of 180 ms, which reaches the high parts in 10−18 level with an averaging time of only 1 day. These work laid the technical foundation for the subsequent clock systematic evaluation and the packaging of each subsystem into an engineering prototype with high-precision at the level of 10−18.