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日本物理学会講演概要集

24pAG-6 The second Yb^+ ion trap system for evaluation of uncertainty of optical clocks

Shohei Higashitani, Yasutaka Imai, Kazuhiko Sugiyama, Masao Kitano

Published Mar 21, 2015• 0 citations
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Optical Clocks with Trapped Ions: Establishing the 10–18 Uncertainty Range

E. Peik

Laser Spectroscopy•Oct 5, 2016•0 citations

Evaluation of trap-induced systematic frequency shifts for a multi-ion optical clock at the 10−19level

Jonas Keller, T. Burgermeister, Dimitri Kalincev +2 more

In order to improve the short-term stability of trapped-ion optical clocks, we are developing a frequency standard based on 115 In + / 172 Yb + Coulomb crystals. For this purpose, we have developed scalable segmented Paul traps which allow a high level of control for multiple ion ensembles. In this article, we detail on our recent results regarding the reduction of the leading sources of frequency uncertainty introduced by the ion trap: 2nd-order Doppler shifts due to micromotion and the heating of secular motion, as well as the black-body radiation shift due to warming of the trap. We show that the fractional frequency uncertainty due to each of these effects can be reduced to well below 10 -19 .

arXiv:1512.05677•Journal of Physics Conference Series•Jun 1, 2016•29 citations

The Development of the NIM-Yb1 Ion Optical Clock

Shaoyang Dai, Yani Zuo, Chaowei Wang +6 more

Optical clocks serve as the benchmark devices for the next-generation definition of the second and have significant applications in testing the theories beyong the standard models, dark matter research, and related fields.The ytterbium ion optical clock, featuring two clock transition lines, is among the most precise optical clocks with the lowest uncertainties.The National Institute of Metrology, China (NIM), initiated research on ytterbium ion optical clocks in 2021.Based on an end-cap ion trap, a vacuum system has been established.A 370 nm thirdharmonic fiber laser, along with 760 nm and 935 nm DFB lasers, ensures a stable operation of the optical system.To date, both the electric quadrupole and electric octupole clock transitions have been observed.A 2.8 Hz linewidth of the electric octupole transition has been achieved, with a stability of 1.7E-15 τ -1/2 after closed-loop locking.The uncertainties due to AC Starks shift from clock laser and second-order Doppler shifts are being evaluated, with an expected total uncertainty below 5E-18.

URSI Asia-Pacific Radio Science Conference•Jan 1, 2025•1 citation

Towards an Yb+ optical clock with a BBR uncertainty below 10^(-18)

Jonathan M. Jones, R. M. Godun, S. A. King +8 more

European Frequency and Time Forum•Jan 1, 2016•0 citations

171Yb+ ion optical clock at NPL: advances in automation and assessment of the trap-induced ac Zeeman shift in an endcap trap geometry

E. A. Curtis, Alexandra Tofful, Adam O. Parsons +2 more

Abstract Ensuring robust operation of optical clock systems requires increasingly complex automation of experimental protocols. This includes real-time monitoring of system output for data validation and for high accuracy assessment of systematic frequency shifts. We report here on recent advances in the control system of the 171 Yb+ ion optical clock at NPL (National Physical Laboratory, UK) and describe how this has led to improvements in systematic shift metrology and reduced the overall uncertainty budget for the optical clock. Additionally we present an assessment of the rf trap drive-induced ac Zeeman effect for our experimental system. These system advances enable us to provide improved contributions to the international efforts in the redefinition of the SI second and other applications such as tests of fundamental physics.

Journal of Physics Conference Series•Nov 1, 2024•0 citations

Trapped Yb+ as a Potential Optical Frequency Standard

G. P. Barwood, A.S. Bell, Patrick Robert Gill +1 more

Springer eBooks•Jan 1, 1989•3 citations
In order to improve the short-term stability of trapped-ion optical clocks, we are developing a frequency standard based on 115 In + / 172 Yb + Coulomb crystals. For this purpose, we have developed scalable segmented Paul traps which allow a high level of control for multiple ion ensembles. In this article, we detail on our recent results regarding the reduction of the leading sources of frequency uncertainty introduced by the ion trap: 2nd-order Doppler shifts due to micromotion and the heating of secular motion, as well as the black-body radiation shift due to warming of the trap. We show that the fractional frequency uncertainty due to each of these effects can be reduced to well below 10 -19 .
Optical clocks serve as the benchmark devices for the next-generation definition of the second and have significant applications in testing the theories beyong the standard models, dark matter research, and related fields.The ytterbium ion optical clock, featuring two clock transition lines, is among the most precise optical clocks with the lowest uncertainties.The National Institute of Metrology, China (NIM), initiated research on ytterbium ion optical clocks in 2021.Based on an end-cap ion trap, a vacuum system has been established.A 370 nm thirdharmonic fiber laser, along with 760 nm and 935 nm DFB lasers, ensures a stable operation of the optical system.To date, both the electric quadrupole and electric octupole clock transitions have been observed.A 2.8 Hz linewidth of the electric octupole transition has been achieved, with a stability of 1.7E-15 τ -1/2 after closed-loop locking.The uncertainties due to AC Starks shift from clock laser and second-order Doppler shifts are being evaluated, with an expected total uncertainty below 5E-18.
Abstract Ensuring robust operation of optical clock systems requires increasingly complex automation of experimental protocols. This includes real-time monitoring of system output for data validation and for high accuracy assessment of systematic frequency shifts. We report here on recent advances in the control system of the 171 Yb+ ion optical clock at NPL (National Physical Laboratory, UK) and describe how this has led to improvements in systematic shift metrology and reduced the overall uncertainty budget for the optical clock. Additionally we present an assessment of the rf trap drive-induced ac Zeeman effect for our experimental system. These system advances enable us to provide improved contributions to the international efforts in the redefinition of the SI second and other applications such as tests of fundamental physics.