Mass selective laser cooling of <sup>229</sup>Th<sup>3+</sup> in a multisectional linear Paul trap loaded with a mixture of thorium isotopes

Borisyuk, P. V.; Derevyashkin, S. P.; Khabarova, K. Yu.; Kolachevsky, N. N.; Lebedinsky, Yury Yu; Poteshin, S. S.; Сысоев, А. А.; Tkalya, E. V.; Tregubov, D. O.; Troyan, V. I.; Vasiliev, O. S.; Yakovlev, V. P.; Yudin, V. I.

doi:10.1177/1469066717718368

Cited by 8 publications

(8 citation statements)

References 26 publications

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Section: Discussionmentioning

confidence: 99%

“…A few different methods have been employed to improve selectivity further [51,55,[74][75][76][77][78]. These methods involve heating the unwanted isotope out of the trap using either the cooling lasers [51,55,[74][75][76], or by applying an additional rf to the trap, exciting the secular motion [77,78]. Alternatively, a different photoionization path could be employed, with the first step of photionization exciting to the 6 3 P 1 state using a 791 nm laser [19,20,22].…”

Section: Discussionmentioning

confidence: 99%

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Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

White,

Low,

de Sereville

et al. 2021

Preprint

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The 133 Ba + ion is a promising candidate as a high-fidelity qubit, and the 137 Ba + isotope is promising as a high-fidelity qudit (d > 2). Barium metal is very reactive, and 133 Ba + is radioactive and can only be sourced in small quantities, so the most commonly used loading method, oven heating, is less suited for barium, and is currently not possible for 133 Ba + . Pulsed laser ablation solves both of these problems by utilizing compound barium sources, while also giving some distinct advantages, such as fast loading, less displaced material, and lower heat load near the ion trap. Because of the relatively low abundances of the isotopes of interest, a two-step photoionization technique is used, which gives us the ability to selectively load isotopes. Characterization of the ablation process for our BaCl2 targets are presented, including observation of neutral and ion ablation-fluence regimes, preparation/conditioning and lifetimes of ablation spots, and plume velocity distributions. We show that using laser ablation on BaCl2 salt targets with a two-step photoionization method, we can produce and trap barium ions reliably. Further, we demonstrate that with our photoionization method, we can trap 137 Ba + with an enhanced selectivity compared to its natural abundance.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

White,

Low,

de Sereville

et al. 2021

Preprint

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“…Paul trapping of 229 Th ions has been achieved at PTB [132,221,344,422] at the Georgia Institute of Technology [57,58,278,279] and at LMU [321,398]. Several further experiments have reported preparatory trapping of 232 Th ions, which has the advantage of a lower radioactivity [37,38,41,109,264,341,380,382,383]. Importantly, thorium is a very reactive element.…”

Section: Paul Trapping Of 229 Th Ionsmentioning

confidence: 99%

“…Direct laser cooling of 229 Th 3+ is also in preparation at MEPhI to provide the basis for nuclear laser spectroscopy in a Paul trap and the development of a nuclear clock [37][38][39]41,380,382,383].…”

Section: Direct Laser Coolingmentioning

confidence: 99%

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

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The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

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“…In addition, the 229 Th nucleus is expected to be an excellent system for the search for time variation of fundamental constants [34][35][36]. To this date, a few groups worldwide have demonstrated thorium trapping in ion traps [37][38][39][40][41][42][43][44]. The nuclear clock is not the only stimulating application of thorium ion traps.…”

Section: Introductionmentioning

confidence: 99%

Studies of thorium and ytterbium ion trap loading from laser ablation for gravity monitoring with nuclear clocks

Piotrowski¹,

Scarabel²,

Lobino³

et al. 2020

OSA Continuum

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Compact and robust ion traps for thorium are enabling technology for the next generation of atomic clocks based on a low-energy isomeric transition in the thorium-229 nucleus. We aim at a laser ablation loading of single triply ionized thorium in a radio-frequency electromagnetic linear Paul trap. Detection of ions is based on a modified mass spectrometer and a channeltron with single-ion sensitivity. In this study, we successfully created and detected 232 Th + and 232 Th 2+ ions from plasma plumes, studied their yield evolution, and compared the loading to a quadrupole ion trap with Yb. We explore the feasibility of laser ablation loading for future low-cost 229 Th 3+ trapping. The thorium ablation yield shows a strong depletion, suggesting that we have ablated oxide layers from the surface and the ions were a result of the plasma plume evolution and collisions. Our results are in good agreement with similar experiments for other elements and their oxides.

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Mass selective laser cooling of ²²⁹Th³⁺ in a multisectional linear Paul trap loaded with a mixture of thorium isotopes

Cited by 8 publications

References 26 publications

Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Studies of thorium and ytterbium ion trap loading from laser ablation for gravity monitoring with nuclear clocks

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Mass selective laser cooling of 229Th3+ in a multisectional linear Paul trap loaded with a mixture of thorium isotopes

Cited by 8 publications

References 26 publications

Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

Isotope-Selective Laser Ablation Ion-Trap Loading of $\mathbf{^{137}\mathrm{Ba}^+}$ using a $\mathbf{\mathrm{BaCl}_2}$ Target

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Studies of thorium and ytterbium ion trap loading from laser ablation for gravity monitoring with nuclear clocks

Contact Info

Product

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Mass selective laser cooling of ²²⁹Th³⁺ in a multisectional linear Paul trap loaded with a mixture of thorium isotopes