The optical atomic clocks have the potential to transform global timekeeping, relying on the state-of-the-art accuracy and stability, and greatly improve the measurement precision for a wide range of scientific and technological applications. Herein we report on the development of the optical clock based on 171 Yb atoms confined in an optical lattice. A minimum width of 1.92-Hz Rabi spectra has been obtained with a new 578-nm clock interrogation laser. The in-loop fractional instability of the 171 Yb clock reaches 9.1 × 10 −18 after an averaging over a time of 2.0 × 10 4 s. By synchronous comparison between two clocks, we demonstrate that our 171 Yb optical lattice clock achieves a fractional instability of ##IMG## [http://ej.iop.org/images/1674-1056/29/9/090601/cpb_29_9_090601_ieqn1.gif] {$4.60\times {10}^{-16}/\sqrt{\tau }$} .

中文翻译：

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基于超冷171 Yb原子的光钟的研究

依靠最先进的准确性和稳定性，光学原子钟有可能改变全球的计时方式，并极大地提高了广泛科学技术应用的测量精度。在此，我们报道基于171个Yb原子的光学时钟的发展，这些原子被限制在一个光学晶格中。新型578 nm时钟询问激光器已获得1.92 Hz Rabi光谱的最小宽度。经过2.0×10 4 s的时间平均后，171 Yb时钟的环路内分数不稳定性达到9.1×10 -18。通过两个时钟之间的同步比较，我们证明了我们的171 Yb光学晶格时钟实现了## IMG ##的不稳定性分数[http://ej.iop.org/images/1674-1056/29/9/090601/cpb_29_9_090601_ieqn1 .gif] {$ 4.60 \ times {10} ^ {-16} / \ sqrt {\ tau} $}。