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by intracavity high-harmonic generation toward state detection of single trapped ions,” Applied Physics B 117, 957(2014).9K. Hayasaka, “Synthesis of two-species ion chains for a new optical frequency standard with an indium ion,” Applied Physics B 107, 965(2012).10U. Tanaka, T. Kitanaka, K. Hayasaka, and S. Urabe, “Sideband cooling of a Ca+–In+ ion chain toward the quantum logic spectroscopy of In+,” Applied Physics B 121, 147 (2015).11Kazuhiro Hayasaka, ”Quantum computer and optical frequency standards,” Journal of Japanese Physical Society 69, 830(2014) (in Japanese).12J. von Zanthier, Th. Becker, M. Eichenseer, A. Yu. Nevsky, Ch. Schwedes, E. Peik, H. Walther, R. Holzwarth, J. Reichert, Th. Udem, T.W. Hänsch, P.V. Pokasov, M.N. Skvortsov, and S.N. Bagayev, “Absolute frequency measure-ment of the In+ clock transition with a mode-locked laser,” Optics. Letters 25, 1729 (2000).13Y. H. Wang, R. Dumke, T. Liu, A. Stejskal, Y. N. Zhao, J. Zhang, Z. H. Lu, L. J. Wang, Th. Becker, and H. Walther, “Absolute frequency measurement of the 115In+ 5s2 1S0-5s5p 3P0 narrowline transition,” Optics Communications 273, 526 (2007).14N. Ohtsubo, Y. Li, K. Matsubara, T. Ido, and K. Hayasaka, “Frequency measure-ment of the clock transition of an indium ion sympathetically-cooled in a linear trap,” Optics Express, 25, 11725 (2017).15K. Pyka, N. Herschbach , J. Keller , and Tanja E. Mehlstäubler, “A high-precision segmented Paul trap with minimized micromotion for an optical multiple-ion clock,” Applied Physics B 114, 231 (2014).16P. Kómár, E. M. Kessler, M. Bishof, L. Jiang, A. S. Sørensen, J. Ye and M. D. Lukin, “A quantum network of clocks,” Nature Physics 10, 582 (2014).Kazuhiro HAYASAKA, Ph.DResearch Manager, Quantum ICT Advanced Development CenterQuantum electronics, Quantum optics, Optical clockKentaro WAKUI, Ph.DPlanning Manager, Strategic Planning Office, Strategic Planning DepartmentQuantum optics, Quantum electronicsNozomi OHTSUBO, Ph.DResearcher, Space-Time Standards laboratory, Applied Electromagnetic reserch InstituteOptical frequency standards, Quantum electronicsYing LI, Ph.DTemporary Staff, Space-Time Standards laboratory, Applied Electromagnetic reserch InstituteOptical frequency standards, Laser physicsKensuke MATSUBARA, Ph.DSenior Researcher, Space-Time Standards laboratory, Applied Electromagnetic reserch InstituteQuantum electronics, Time and frequency standardsTetsuya IDO, Ph.DDirector, Space-Time Standards laboratory, Applied Electromagnetic reserch InstituteOptical frequency standards, Optical precision measurements, Laser cooling4 Quantum Node Technology 78　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 1 (2017)