12 September 2011 Optical direct comparison of 87Sr optical lattice clocks using a >50 km telecommunication fiber link
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Abstract
An 87Sr-based-optical lattice clock in NICT is compared to that of The University of Tokyo using a >50 km fiber link. In this work, we have demonstrated for the first time that two distant Sr lattice clocks generate the same frequency with systematic uncertainty of 0.31 Hz (7.3 × 10-16 fractionally) for the 429 THz clock frequency.
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Hidekazu Hachisu, Hidekazu Hachisu, Atsushi Yamaguchi, Atsushi Yamaguchi, Miho Fujieda, Miho Fujieda, Motohiro Kumagai, Motohiro Kumagai, Shigeo Nagano, Shigeo Nagano, Ying Li, Ying Li, Tetsuya Ido, Tetsuya Ido, Tetsushi Takano, Tetsushi Takano, Masao Takamoto, Masao Takamoto, Hidetoshi Katori, Hidetoshi Katori, } "Optical direct comparison of 87Sr optical lattice clocks using a >50 km telecommunication fiber link", Proc. SPIE 8132, Time and Frequency Metrology III, 81320A (12 September 2011); doi: 10.1117/12.893357; https://doi.org/10.1117/12.893357
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