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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 14 — Jul. 15, 2014
  • pp: 4072–4075

Direct comparison of optical lattice clocks with an intercontinental baseline of 9000  km

H. Hachisu, M. Fujieda, S. Nagano, T. Gotoh, A. Nogami, T. Ido, St. Falke, N. Huntemann, C. Grebing, B. Lipphardt, Ch. Lisdat, and D. Piester  »View Author Affiliations

Optics Letters, Vol. 39, Issue 14, pp. 4072-4075 (2014)

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We have demonstrated a direct frequency comparison between two Sr87 lattice clocks operated in intercontinentally separated laboratories in real time. Two-way satellite time and frequency transfer technique, based on the carrier-phase, was employed for a direct comparison, with a baseline of 9000 km between Japan and Germany. A frequency comparison was achieved for 83,640 s, resulting in a fractional difference of (1.1±1.6)×1015, where the statistical part is the largest contributor to the uncertainty. This measurement directly confirms the agreement of the two optical frequency standards on an intercontinental scale.

© 2014 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6520) Spectroscopy : Spectroscopy, trapped ion
(020.3320) Atomic and molecular physics : Laser cooling

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 25, 2014
Revised Manuscript: May 4, 2014
Manuscript Accepted: May 26, 2014
Published: July 2, 2014

H. Hachisu, M. Fujieda, S. Nagano, T. Gotoh, A. Nogami, T. Ido, St. Falke, N. Huntemann, C. Grebing, B. Lipphardt, Ch. Lisdat, and D. Piester, "Direct comparison of optical lattice clocks with an intercontinental baseline of 9000  km," Opt. Lett. 39, 4072-4075 (2014)

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