Related papers: High-Stability Single-Ion Clock with $5.5\times10^{-19}$ Systematic Uncertainty

High-Stability Single-Ion Clock with $5.5\times10^{-19}$ Systematic Uncertainty

URL: http://arxiv.org/abs/2504.13071v1
Date: Thu, 17 Apr 2025 16:32:15 GMT
Title: High-Stability Single-Ion Clock with $5.5\times10^{-19}$ Systematic Uncertainty
Authors: Mason C. Marshall, Daniel A. Rodriguez Castillo, Willa J. Arthur-Dworschack, Alexander Aeppli, Kyungtae Kim, Dahyeon Lee, William Warfield, Joost Hinrichs, Nicholas V. Nardelli, Tara M. Fortier, Jun Ye, David R. Leibrandt, David B. Hume,
Abstract summary: We report a single-ion optical atomic clock with fractional frequency uncertainty of $5.5times10-19$ and fractional frequency stability of $3.5 times10-16/sqrttau/mathrms$.<n>Based on quantum logic spectroscopy of a single $27$Al$+$ ion.
Score: 33.06992219558038
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We report a single-ion optical atomic clock with fractional frequency uncertainty of $5.5\times10^{-19}$ and fractional frequency stability of $3.5 \times10^{-16}/\sqrt{\tau/\mathrm{s}}$, based on quantum logic spectroscopy of a single $^{27}$Al$^+$ ion. A co-trapped $^{25}$Mg$^+$ ion provides sympathetic cooling and quantum logic readout of the $^{27}$Al$^+$ $^1$S$_0\leftrightarrow^3$P$_0$ clock transition. A Rabi probe duration of 1 s, enabled by laser stability transfer from a remote cryogenic silicon cavity across a 3.6 km fiber link, results in a threefold reduction in instability compared to previous $^{27}$Al$^+$ clocks. Systematic uncertainties are lower due to an improved ion trap electrical design, which reduces excess micromotion, and a new vacuum system, which reduces collisional shifts. We also perform a direction-sensitive measurement of the ac magnetic field due to the RF ion trap, eliminating systematic uncertainty due to field orientation.

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