Hyperfine-mediated effects in a 
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 optical clock

Zhang, Zhiqiang; Arnold, K. J.; Kaewuam, R.; Safronova, M. S.; Barrett, M. D.

doi:10.1103/physreva.102.052834

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The hyperfine interaction gives rise to a quadrupole shift that is not eliminated by HA. The shift is characterized by a residual quadrupole moment of −2.5 × 10 −4 ea 0 2 as determined from a combination of g -factor measurements and theory ( 16 ). The shift can then be estimated using the quadrupole shift extracted from S 1/2 ↔ D 5/2 clock measurements in Ba + and rescaling the quadrupole moments.…”

Section: Resultsmentioning

confidence: 99%

“…1A . As described in previous work ( 16 , 17 ), laser beams at 350, 622, and 895 nm facilitate optical pumping into the long-lived 3 D 1 state; laser beams at 646 nm facilitate detection, Doppler cooling, and state preparation of ∣7〉 ≡ ∣ 3 D 1 , F = 7, m F = 0〉; and microwaves are used to drive transitions between the 3 D 1 hyperfine states. This work concerns the 1 S 0 ↔ 3 D 1 transition at 848 nm, which has favorable properties as a frequency reference.…”

Section: Introductionmentioning

confidence: 98%

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¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy

et al. 2023

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The extreme precision of optical atomic clocks has led to an anticipated redefinition of the second by the International System of Units. Furthermore, accuracies pushing the boundary of 1 part in 10 18 and beyond will enable new applications, such as in geodesy and tests of fundamental physics. The 1 S 0 to 3 D 1 optical transition in 176 Lu + has exceptionally low sensitivity to external perturbations, making it suitable for practical clock implementations with inaccuracy at or below 10 −18 . Here, we perform high-accuracy comparisons between two 176 Lu + references using correlation spectroscopy. A comparison at different magnetic fields is used to obtain a quadratic Zeeman coefficient of −4.89264(88) Hz/mT for the reference frequency. With a subsequent comparison at low field, we demonstrate agreement at the low 10 −18 level, statistically limited by the averaging time of 42 hours. The evaluated uncertainty in the frequency difference is 9 × 10 −19 and the lowest reported in comparing independent optical references.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy

et al. 2023

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“…It is anticipated that the use of compound clocks could improve the stability of single ion clocks with long clock transition lifetimes to levels comparable to that of optical lattice clocks [50]. For ion species with shorter lifetimes, the stability can be improved directly by increasing the number of ions, but this approach requires special care in the selection of the atomic transition and the control of the systematic shifts to preserve accuracy [51,52]. Entanglement in multi-ion or neutral atom clocks offers the potential for a stability beyond the standard quantum limit and thus could be a method to further improve the stability of optical clocks [53].…”

Section: Ongoing Research Activities and Future Prospects For Optical...mentioning

confidence: 99%

“…Finally, one of the most exciting directions in optical clock research today is the search for transitions that have still lower sensitivities to external fields than current optical clocks in an effort to further reduce clock uncertainties. Some of these include a nuclear transition in 229m Th [66], and transitions in highly-charged ions [67,68] and lutetium ions [52]. While all of these systems present their own technological challenges, they could well be among the main candidates for future optical clocks with performance at the 19th and 20th digits.…”

Section: Ongoing Research Activities and Future Prospects For Optical...mentioning

confidence: 99%

Roadmap towards the redefinition of the second

Dimarcq,

Gertsvolf,

Mileti

et al. 2024

Metrologia

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This paper outlines the roadmap towards the redefinition of the second, which was recently updated by the CCTF Task Force created by the CCTF in 2020. The main achievements of optical frequency standards (OFS) call for reflection on the redefinition of the second, but open new challenges related to the performance of the optical frequency standards, their contribution to time scales and UTC, the possibility of their comparison, and the knowledge of the Earth’s gravitational potential to ensure a robust and accurate capacity to realize a new definition at the level of 10-18 uncertainty. The mandatory criteria to be achieved before redefinition have been defined and their current fulfilment level is estimated showing the fields that still needed improvement. The possibility to base the redefinition on a single or on a set of transitions has also been evaluated. The roadmap indicates the steps to be followed in the next years to be ready for a sound and successful redefinition.

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“…The Barrett group in Singapore has developed a spectroscopic technique for evaluating B ⊥ , which involves measuring Autler-Townes line splittings induced by the parasitic rf magnetic field [18]. Using this technique, they have demonstrated evaluation of B ⊥ at the partper-thousand (ppt) level, with observed values of B ⊥ ≈ 1 µT [18,[37][38][39]. A moderate dc magnetic field is required, B ∼ ω/µ B ∼ mT, such to tune a dc Zeeman splitting into resonance with the trap drive frequency.…”

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confidence: 99%

Trap-induced ac Zeeman shift of the thorium-229 nuclear clock frequency

Beloy

2023

Preprint

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We examine the effect of a parasitic rf magnetic field, attributed to ion trapping, on the highly anticipated nuclear clock based on 229 Th 3+ [C. J. Campbell et al., Phys. Rev. Lett. 108, 120802 (2012)]. The rf magnetic field induces an ac Zeeman shift to the clock frequency. As we demonstrate, this shift threatens to be the dominant systematic frequency shift for the clock, exceeding other systematic frequency shifts and the projected systematic uncertainty of the clock by orders of magnitude. We propose practical means to suppress or eliminate this shift.

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Hyperfine-mediated effects in a Lu+ optical clock

Cited by 5 publications

References 16 publications

¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy

¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy

Roadmap towards the redefinition of the second

Trap-induced ac Zeeman shift of the thorium-229 nuclear clock frequency

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Hyperfine-mediated effects in a Lu+ optical clock

Cited by 5 publications

References 16 publications

176 Lu + clock comparison at the 10 −18 level via correlation spectroscopy

176 Lu + clock comparison at the 10 −18 level via correlation spectroscopy

Roadmap towards the redefinition of the second

Trap-induced ac Zeeman shift of the thorium-229 nuclear clock frequency

Contact Info

Product

Resources

About

¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy

¹⁷⁶ Lu ⁺ clock comparison at the 10 ⁻¹⁸ level via correlation spectroscopy