High-Performance Microwave Frequency Standard Based on Sympathetically Cooled Ions

Qin, Haoran; Miao, S. N.; Han, J. Z.; Xin, N. C.; Chen, Yi-Ting; Zhang, J. W.; Wang, L. J.

doi:10.1103/physrevapplied.18.024023

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Cited by 10 publications

References 42 publications

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High-Performance Microwave Frequency Standard Systems Based on the Ground-State Hyperfine Splitting of 171Yb+ and 113Cd+ Ions

Zheng,

Chen,

Xin

et al. 2023

Lecture Notes in Electrical Engineering

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High-Performance Microwave Frequency Standard Systems Based on the Ground-State Hyperfine Splitting of 171Yb+ and 113Cd+ Ions

Zheng,

Chen,

Xin

et al. 2023

Lecture Notes in Electrical Engineering

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174Yb+–113Cd+ sympathetic-cooling bi-species Coulomb crystal applied to microwave frequency standard

Zheng,

Qin,

Miao

et al. 2023

Applied Physics Letters

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We reported the realization of a 174Yb+–113Cd+ bi-species Coulomb crystal comprising 174Yb+, a heavier ion, as coolant and verified the potential of applying a coolant ion with a greater mass than the clock ion to sympathetically cooled microwave frequency standard. The two species of massive ions stably trapped in a Paul trap make up this large two-component crystal. The 113Cd+ ions are trapped in the center, which reduces considerably RF heating and excess micro-motion to which the 113Cd+ ions are subjected. Under this scheme, the uncertainty due to the second-order Doppler effect is reduced to 5×10−16, which represents an order of magnitude improvement over sympathetic cooled 40Ca+–113Cd+ crystal. The second-order Zeeman frequency shift, which contributes the largest term of the systematic frequency shifts to the microwave ion frequency standard, is estimated to be as low as 7.133×10−13 corresponding to the low value of the operating magnetic field. The relevant AC Stark shift uncertainty is estimated to be 4×10−19. These results demonstrate that using a heavier coolant ion is far superior and confirm the feasibility of a sympathetic-cooled cadmium-ion microwave clock system employing a 174Yb+–113Cd+ bicrystal.

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Determination of the ground-state hyperfine splitting of trapped 171Yb+ ions

Han,

Xin,

Zhang

et al. 2024

Applied Physics Letters

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We present the determination of the ground-state hyperfine splitting (νHFS) in laser-cooled 171Yb+ ions using our microwave quantum frequency standard (QFS). Employing Ramsey spectroscopy in a closed-loop measurement configuration, we have achieved a νHFS value of 12 642 812 118 469.0(8) mHz with a fractional uncertainty of 6.6×10−14. This result aligns with previously reported values and represents the highest accuracy reported to date for such measurements conducted in a single-shot closed-loop configuration, without averaging over multiple dates. The development of this accurate 171Yb+ microwave QFS holds promise as a transportable time-frequency reference for satellite navigation systems.

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High-Performance Microwave Frequency Standard Based on Sympathetically Cooled Ions

Cited by 10 publications

References 42 publications

High-Performance Microwave Frequency Standard Systems Based on the Ground-State Hyperfine Splitting of 171Yb+ and 113Cd+ Ions

High-Performance Microwave Frequency Standard Systems Based on the Ground-State Hyperfine Splitting of 171Yb+ and 113Cd+ Ions

174Yb+–113Cd+ sympathetic-cooling bi-species Coulomb crystal applied to microwave frequency standard

Determination of the ground-state hyperfine splitting of trapped 171Yb+ ions

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