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Phys Rev Lett. 2013 Jun 7;110(23):230801. Epub 2013 Jun 6.

Precision measurement of the hydrogen 1S-2S frequency via a 920-km fiber link.

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Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
LNE-SYRTE, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France.
Laboratoire Kastler-Brossel, CNRS, 75231 Paris, France.
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.
Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA.


We have measured the frequency of the extremely narrow 1S-2S two-photon transition in atomic hydrogen using a remote cesium fountain clock with the help of a 920 km stabilized optical fiber. With an improved detection method we obtain f(1S-2S)=2466 061 413 187 018 (11)  Hz with a relative uncertainty of 4.5×10(-15), confirming our previous measurement obtained with a local cesium clock [C. G. Parthey et al., Phys. Rev. Lett. 107, 203001 (2011)]. Combining these results with older measurements, we constrain the linear combinations of Lorentz boost symmetry violation parameters c((TX))=(3.1±1.9)×10(-11) and 0.92c((TY))+0.40c((TZ))=(2.6±5.3)×10(-11) in the standard model extension framework [D. Colladay, V. A. Kostelecký, Phys. Rev. D. 58, 116002 (1998)].

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