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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.

Author information

1
Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
2
LNE-SYRTE, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France.
3
Laboratoire Kastler-Brossel, CNRS, 75231 Paris, France.
4
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.
5
Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA.

Abstract

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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