2013 Fiscal Year Final Research Report
Search for temporal variation of the fundamental constants by using single-ion optical clocks
| Project Area | Extreme quantum world opened up by atoms -towards establishing comprehensive picture of the universe based on particle physics- |
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| Project/Area Number |
21104006
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
SUGIYAMA Kazuhiko 京都大学, 工学(系)研究科(研究院), 准教授 (10335193)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Utako 大阪大学, 大学院基礎工学研究科, 講師 (20359087)
MORINAGA Atsuo 東京理科大学, 理工学部, 教授 (90246687)
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| Co-Investigator(Renkei-kenkyūsha) |
KITANO Masao 京都大学, 大学院工学研究科, 教授 (70115830)
AKATSUKA Tomoya 理化学研究所, 特別研究員 (90548257)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 物理定数 / 量子エレクトロニクス / 超精密計測 / 原子分子物理 / 高性能レーザー |
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| Research Abstract |
We aim at search for a temporal variation of the fine structure constant by frequency-ratio measurement between the single-ion optical clocks, of which references are different transitions in Yb+ and Ba+. Detection of a temporal variation will lead to a new theory which reveals the origin of the dark energy.
We succeeded in single-ion spectroscopy of the 2S1/2-2D5/2 transition in 174Yb+, and then, 2S1/2-2D3/2 in 171Yb+ of a potential of better uncertainty, and the success enables us to realize the optical clocks of different transitions. We realized optical frequency-ratio measurement, and are developing a system of long-term continuous operation with a Yb:KYW laser. We achieved almost all the techniques required, including a clock laser with a 1-Hz linewidth, a surface trap of better detection efficiency of the fluorescence, and preparations for other clock transitions. We will measure uncertainties of the clocks, and start searching a temporal variation in the near future.
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