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Using surface-electrodes ion traps for optical frequency metrology

Clément Lacroûte, Josipa Madunic, T. Lauprêtre, Bachir Achi, Lucas Groult, Y. Kersalé, Marion Delehaye, Moustafa Abdel Hafiz

Published Oct 25, 2023• 0 citations
OpenAlex

Abstract

In this talk, I will briefly review state-of-the-art optical atomic clocks and their potential applications for field measurements. I will then present our transportable optical clock project and the progress made in the design and fabrication of surface-electrodes ion traps

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Optical atomic clocks are the world's most accurateinstruments. Even though they are still voluminous instruments, there is a needfor on-field measurements campaigns. I will first give a brief state-of-the-artof optical atomic clocks, and then review existing approaches towards therealization of transportable atomic clocks. Finally, I will introduce thedesign of our prototype surface electrode trap for optical frequency metrology. <!--[if gte mso 9]> <![endif]--><!--[if gte mso 9]> Normal 0 21 false false false FR X-NONE X-NONE <![endif]--><!--[if gte mso 9]>

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Optical clocks enable frequency measurements with a systematicfractionaluncertainty of 10^-18 and lower. These clocks use opticaltransitions ofcold trapped ions in radio-frequency traps or cold ensembles oftrappedneutral atoms as frequency references with long-term stability.There isan increasing demand for commercially available precise clocksfor bigdata, stock exchange, and positioning systems. Further,ultra-precise clockscan be used to test General Relativity, search for new physics,and geodeticmeasurements. Todate, precise clocks are realized mainly inlaboratoryexperiments and require highly trained operators. We aredeveloping chip-basedion traps for portable optical clocks that can be used for field measurements,as well as multi-ion clocks that enable faster precisionmeasurements.In this talk, we will give an update on ion trap technologiesthat willhelp to make the clocks smaller. This includes more compactelectricalconnections and space-saving

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Optical atomic clocks are the world's most accurateinstruments. Even though they are still voluminous instruments, there is a needfor on-field measurements campaigns. I will first give a brief state-of-the-artof optical atomic clocks, and then review existing approaches towards therealization of transportable atomic clocks. Finally, I will introduce thedesign of our prototype surface electrode trap for optical frequency metrology. <!--[if gte mso 9]> <![endif]--><!--[if gte mso 9]> Normal 0 21 false false false FR X-NONE X-NONE <![endif]--><!--[if gte mso 9]>
For the past 15 years, tremendous progress within the fields of laser stabilization, optical frequency combs and atom cooling and trapping have allowed the realization of optical atomic clocks with unrivaled performances. These instruments can perform frequency comparisons with fractional uncertainties well below 10-17, finding applications in fundamental physics tests, relativistic geodesy and time and frequency metrology. Even though most optical clocks are currently laboratory setups, several proposals for using these clocks for field measurements or within an optical clock network have been published, and most of time and frequency metrology institutes have started to develop transportable optical clocks. For the purpose of this special issue, we chose to focus on trapped-ion optical clocks. Even though their short-term fractional frequency stability is impaired by a lower signal-to-noise ratio, they offer a high potential for compactness: trapped ions demand low optical powers and simple loading schemes, and can be trapped in small vacuum chambers. We review recent advances on the clock key components, including ion trap and ultra-stable optical cavity, as well as existing projects and experiments which draw the picture of what future transportable, single-ion optical clocks may resemble.
Optical atomic clocks based on laser-cooled trapped ions and atoms have advanced rapidly over the past decade. With fractional frequency uncertainties now surpassing 10 −18 , they are some of the most precise measurement tools ever built. Yet researchers are still pursuing new avenues of research to explore the fundamental limits to their stability, accuracy, and reproducibility. In this mini-review, we provide a survey of the current state of the art by describing the fundamental principles and techniques that underpin this progress, the architectures used to realize optical clocks, and the supporting laser technologies that are essential to their operation. We also examine the progress that has been made toward a redefinition of the second in the International System of Units and the inclusion of optical clocks into the global time and frequency metrology infrastructure. Finally, we discuss emerging applications of optical clocks and look at the prospects for making their precision more readily accessible to end users.
Optical clocks enable frequency measurements with a systematicfractionaluncertainty of 10^-18 and lower. These clocks use opticaltransitions ofcold trapped ions in radio-frequency traps or cold ensembles oftrappedneutral atoms as frequency references with long-term stability.There isan increasing demand for commercially available precise clocksfor bigdata, stock exchange, and positioning systems. Further,ultra-precise clockscan be used to test General Relativity, search for new physics,and geodeticmeasurements. Todate, precise clocks are realized mainly inlaboratoryexperiments and require highly trained operators. We aredeveloping chip-basedion traps for portable optical clocks that can be used for field measurements,as well as multi-ion clocks that enable faster precisionmeasurements.In this talk, we will give an update on ion trap technologiesthat willhelp to make the clocks smaller. This includes more compactelectricalconnections and space-saving