Liquid-Nitrogen-Cooled 
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 Optical Clock with Systematic Uncertainty of 
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Huang, Yao; Zhang, Baolin; Zeng, Meiqin; Hao, Yanmei; Ma, Zixiao; Zhang, Huaqing; Guan, Hua; Chen, Zheng; Wang, Miao; Gao, Kelin

doi:10.1103/physrevapplied.17.034041

Cited by 47 publications

(18 citation statements)

References 40 publications

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“…Laser cooling is an essential tool for modern quantum optics experiments with trapped ions, such as the study of topological defect formation in ion Coulomb crystals [1][2][3][4], quantum simulation [5][6][7] and quantum computation [8]. Highly-accurate ion optical atomic clocks are traditionally operated at the Doppler cooling limit [9,10]. As a consequence of their constantly improving frequency uncertainty, the time dilation due to the residual ion secular motion at Doppler temperature nowadays poses a limiting contribution to the clock's error budget at the low 10 −18 level.…”

Section: Introductionmentioning

confidence: 99%

Systematic study of tunable laser cooling for trapped-ion experiments

et al. 2023

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We report a comparative analysis of quenched sideband cooling in trapped ions. We introduce a theoretical approach for time-efficient simulation of the temporal cooling characteristics and derive the optimal conditions providing fast laser cooling into the ion’s motional ground state. The simulations were experimentally benchmarked with a single 172Yb+ ion confined in a linear Paul trap. Sideband cooling was carried out on a narrow quadrupole transition, enhanced with an additional clear-out laser for controlling the effective linewidth of the cooling transition. Quench cooling was thus for the first time studied in the resolved sideband, intermediate and semi-classical regime. We discuss the non-thermal distribution of Fock states during laser cooling and reveal its impact on time dilation shifts in optical atomic clocks.

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Section: Introductionmentioning

confidence: 99%

Systematic study of tunable laser cooling for trapped-ion experiments

et al. 2023

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“…The frequency uncertainty and instability of the state-ofthe-art optical clocks based on single-ions or neutral atoms have reached 10 −18 level and below. [1][2][3][4][5][6][7][8][9] The unprecedented precision of optical atomic clocks has enabled their application in various areas, such as redefinition of the SI second, [10,11] testing general relativity, [12][13][14] detecting gravitational waves, [15] and searching dark matter. [16] The systematic uncertainty is one of three fundamental benchmarks (including systematic uncertainty, instability, and reproducibility) of clock performance, which is characterized by the uncertainties associated with all known effects that shift the clock frequency.…”

Section: Introductionmentioning

confidence: 99%

Precise measurement of ¹⁷¹Yb magnetic constants for ¹ S ₀–³ P ₀ clock transition

Zhang¹,

Tian²,

Zhu³

et al. 2023

Chinese Phys. B

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We present a precise measurement of $^{171}$Yb magnetic constants for $^{1}S_{0}\,-\,^{3}P_{0}$ clock transition. The background magnetic field is firstly compensated to $< 1\,\rm{mG}$ through measuring the splitting of two $ \pi $ transitins of $^{171}$Yb clock transition at different compensation coils currents. Then, the splitting ratios of the $ \pi $ and $ \sigma $ components of $^{171}$Yb clock transition at different bias magnetic fields are measured, and the first-order Zeeman coefficient is determined to be $\alpha = 199.44\,(5)\,\rm{Hz/G}$. The second-order Zeeman shifts at various bias magnetic fields are also measured through interleaved self-comparison in which the bias magnetic fields are modulated between high and low values. The second-order Zeeman coefficient is fitted to be $ \beta = -6.09\,(3)\,\rm{Hz/mT^{2}}$, which is consistent with the result of NIST.

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“…[9] At this level of accuracy, one of the limiting systematic uncertainties is the Stark shift of the clock transitions induced by blackbody radiation (BBR). [1] Although interrogating atoms in a cryogenic environment [10][11][12][13][14] or in a room-temperature radiation shielded chamber [15] has successfully reduced the BBRinduced shift, a number of atoms have smaller sensitivities to the BBR, which could lead to simpler and more precise atomic clocks. These clocks include optical lattice clocks based on Hg, [16,17] Mg, [18] Tm, [19,20] and Cd, [21] Al + , [22] Yb + , [23] In + , [24] and Lu + [25] ion clocks, Th 3+ nuclear clock, [26,27] and highly charged ion clocks.…”

Section: Introductionmentioning

confidence: 99%

Theoretical calculations on Landé g-factors and quadratic Zeeman shift coefficients of nsnp 3P0o clock states in Mg and Cd optical lattice clocks

Lu¹,

Chang²

2023

Chinese Phys. B

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The study of magnetic field effects on the clock transition of Mg and Cd optical lattice clocks is scarce. In this work, the hyperfine-induced Landé $g$-factors and quadratic Zeeman shift coefficients of the $nsnp~^3\!P^o_0$ clock states for $^{111,113}$Cd and $^{25}$Mg were calculated by using the multi-configuration Dirac-Hartree-Fock theory. To obtain accurate values of these parameters, the impact of electron correlations and furthermore the Breit interaction and quantum electrodynamical effects on the Zeeman and hyperfine interaction matrix elements, and energy separations were investigated in detail. We also estimated the contributions from perturbing states to the Landé $g$-factors and quadratic Zeeman shift coefficients concerned so as to truncate the summation over the perturbing states without loss of accuracy. Our calculations provide important data for estimating the first- and second-order Zeeman shifts of the clock transition for the Cd and Mg optical lattice clocks.

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Liquid-Nitrogen-Cooled Ca + Optical Clock with Systematic Uncertainty of 3×10

Cited by 47 publications

References 40 publications

Systematic study of tunable laser cooling for trapped-ion experiments

Systematic study of tunable laser cooling for trapped-ion experiments

Precise measurement of ¹⁷¹Yb magnetic constants for ¹ S ₀–³ P ₀ clock transition

Theoretical calculations on Landé g-factors and quadratic Zeeman shift coefficients of nsnp 3P0o clock states in Mg and Cd optical lattice clocks

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Liquid-Nitrogen-Cooled Ca + Optical Clock with Systematic Uncertainty of 3×10

Cited by 47 publications

References 40 publications

Systematic study of tunable laser cooling for trapped-ion experiments

Systematic study of tunable laser cooling for trapped-ion experiments

Precise measurement of 171Yb magnetic constants for 1 S 0–3 P 0 clock transition

Theoretical calculations on Landé g-factors and quadratic Zeeman shift coefficients of nsnp 3P0o clock states in Mg and Cd optical lattice clocks

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Precise measurement of ¹⁷¹Yb magnetic constants for ¹ S ₀–³ P ₀ clock transition