Laser spectroscopy of <sup>176</sup>Lu<sup>+</sup>

Kaewuam, R.; Roy, Amit; Tan, Ting Rei; Arnold, K. J.; Barrett, M. D.

doi:10.1080/09500340.2017.1411539

Cited by 17 publications

(28 citation statements)

References 15 publications

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“…The interrogation sequence for the microwave measurements is the same as in ref. [22] with typical interrogation times of 10-50 ms depending on the desired Fourier limited resolution. Polarizability Measurements.…”

Section: Resultsmentioning

confidence: 99%

Blackbody radiation shift assessment for a lutetium ion clock

et al. 2018

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The accuracy of state-of-the-art atomic clocks is derived from the insensitivity of narrow optical atomic resonances to environmental perturbations. Two such resonances in singly ionized lutetium have been identified with potentially lower sensitivities compared to other clock candidates. Here we report measurement of the most significant unknown atomic property of both transitions, the static differential scalar polarizability. From this, the fractional blackbody radiation shift for one of the transitions is found to be −1.36(9) × 10−18 at 300 K, the lowest of any established optical atomic clock. In consideration of leading systematic effects common to all ion clocks, both transitions compare favorably to the most accurate ion-based clocks reported to date. This work firmly establishes Lu+ as a promising candidate for a future generation of more accurate optical atomic clocks.

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Section: Resultsmentioning

confidence: 99%

Blackbody radiation shift assessment for a lutetium ion clock

et al. 2018

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“…The experiments are carried out in a linear Paul trap with axial endcaps, the details of which have been given elsewhere [21,22]. The relevant level structure of 138 Ba + is illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

Measurements of the branching ratios for 6P1/2 decays in Ba+138

et al. 2019

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Measurement of the branching ratios for 6P 1/2 decays to 6S 1/2 and 5D 3/2 in 138 Ba + are reported with the decay probability from 6P 1/2 to 5D 3/2 measured to be p = 0.268177 ± (37)stat − (20)sys. This result differs from a recent report by 12σ. A detailed account of systematics is given and the likely source of the discrepancy is identified. The new value of the branching ratio is combined with a previous experimental results to give a new estimate of τ = 7.855(10) ns for the 6P 1/2 lifetime. In addition, ratios of matrix elements calculated from theory are combined with experimental results to provide improved theoretical estimates of the 6P 3/2 lifetime and the associated matrix elements. arXiv:1905.06523v1 [physics.atom-ph]

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“…Lutetium offers three possible clock transitions, with the focus here being on the 1 S 0 ↔ 3 D 1 transition. An energy level diagram relevant to this work is shown in [20]. An additional π-polarized 646-nm beam addressing F = 7 to F = 7 facilitates state preparation into | 3 D 1 , 7, 0 .…”

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Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock

et al. 2019

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We demonstrate precision measurement and control of inhomogeneous broadening in a multiion clock consisting of three 176 Lu + ions. Microwave spectroscopy between hyperfine states in the 3 D1 level is used to characterise differential systematic shifts between ions, most notably those associated with the electric quadrupole moment. By appropriate alignment of the magnetic field, we demonstrate suppression of these effects to the ∼ 10 −17 level relative to the 1 S0 ↔ 3 D1 optical transition frequency. Correlation spectroscopy on the optical transition demonstrates the feasibility of a 10 s Ramsey interrogation in the three ion configuration with a corresponding projection noise limited stability of σ(τ ) = 8.2 × 10 −17 / √ τ .With fractional uncertainties near to ∼ 10 −18 , stateof-the-art optical atomic clocks are among the most accurate scientific artefacts [1]. The two most successful realizations are ensembles of neutral atoms stored in optical lattices [2,3] and ions confined in radio-frequency (RF) traps [4,5]. The latter offers strong confinement such that atoms can be reused for subsequent clock interrogation and measurement. The stability of the current generation of trapped-ion optical clocks is limited by single-ion operation. This has limited the instability of ion-based clocks to ∼ 10 −15 / √ τ , for which averaging times τ of several days or even weeks are required to reach 10 −18 resolution. Modest improvements to stability can be expected as laser technology develops to allow longer interrogation times but ideally this would go hand-in-hand with an increase in the number of ions.Within the standard quantum limit (SQL), clock stability improves with the √ N where N is the number of atoms [6]. With an ensemble of ions, frequency resolution could be further enhanced using entangled states [7][8][9][10][11] or cascaded interrogation schemes [12,13]. From a technological standpoint, extension of clock operation to a small ensemble of ions is an immediate application for devices developed for small-scale quantum information processing (QIP). However, characterizing and maintaining exquisite control over various systematic effects in an ion ensemble is a significant challenge.Multi-ion operation is complicated by electric quadrupole (EQ) shifts arising from the Coulomb fields of neighbouring ions, excess-micromotion (EMM) shifts induced by the radio-frequency (rf) trapping field, and inhomogeneous magnetic fields. Efforts and proposals towards high-accuracy multi-ion optical clocks include (i) precision engineering of the ion trap to suppress EMM shifts [14], (ii) employing clock transitions with a negative differential scalar polarisability, ∆α 0 , to eliminate EMM shifts in a large ion crystal [15,16], and (iii) using dynamic decoupling or rf-dressed states to 646 nm 1 S 0 3 D 1 3 D 2 3 P 0 = 8 = 7 = 6 847.7 nm Hyperfine splitting: ~11.2 GHz 10.5 GHz 3 P 1 1 D 2 622 nm 895 nm 350 nm FIG. 1. Relevant energy level diagram of a 176 Lu + ion showing: the 1 S0 ↔ 3 D1 clock transition at 848 nm, the 3 D1 ↔ 3 ...

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Laser spectroscopy of ¹⁷⁶Lu⁺

Cited by 17 publications

References 15 publications

Blackbody radiation shift assessment for a lutetium ion clock

Blackbody radiation shift assessment for a lutetium ion clock

Measurements of the branching ratios for 6P1/2 decays in Ba+138

Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock

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Laser spectroscopy of 176Lu+

Cited by 17 publications

References 15 publications

Blackbody radiation shift assessment for a lutetium ion clock

Blackbody radiation shift assessment for a lutetium ion clock

Measurements of the branching ratios for 6P1/2 decays in Ba+138

Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock

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Laser spectroscopy of ¹⁷⁶Lu⁺