Frequency Measurement of the Optical Clock Transition of 40Ca+ Ions with an Uncertainty of 10-14 Level

Kensuke Matsubara; Kazuhiro Hayasaka; Ying Li; Hiroyuki Ito; Shigeo Nagano; Masatoshi Kajita; Mizuhiko Hosokawa

doi:10.1143/APEX.1.067011

Applied Physics Express

Frequency Measurement of the Optical Clock Transition of ⁴⁰Ca⁺ Ions with an Uncertainty of 10^-14 Level

Kensuke Matsubara¹, Kazuhiro Hayasaka¹, Ying Li¹, Hiroyuki Ito¹, Shigeo Nagano¹, Masatoshi Kajita¹ and Mizuhiko Hosokawa¹

Published 6 June 2008 • ©2008 The Japan Society of Applied Physics
Applied Physics Express, Volume 1, Number 6 Citation Kensuke Matsubara et al 2008 Appl. Phys. Express 1 067011 DOI 10.1143/APEX.1.067011

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¹ National Institute of Information and Communications Technology, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan

Dates

Received 18 April 2008
Accepted 17 May 2008
Published 6 June 2008

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Abstract

The absolute frequency of the 4 ²S_1/2–3 ²D_5/2 optical clock transition of ⁴⁰Ca⁺ ions has been measured for the first time with respect to the Système International (SI) second. A single ⁴⁰Ca⁺ ion is laser-cooled in a small ion trap and the transition frequency is measured as the average of two symmetrical Zeeman components. The frequency is determined to be 411 042 129 776 385 (±18) Hz from 48 measurements.

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