Precision Measurement of the Hydrogen 1S−2S Frequency via a 920-km Fiber Link
Jun 6, 2013Published in:
- Phys.Rev.Lett. 110 (2013) 23, 230801
- Published: Jun 6, 2013
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Abstract: (APS)
We have measured the frequency of the extremely narrow 1S\mathrm{\text{\ensuremath{-}}}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\mathrm{\text{\ensuremath{-}}}2S}=2466\text{ }061\text{ }413\text{ }187\text{ }018\text{ }(11)\text{ }\text{ }\mathrm{Hz} with a relative uncertainty of 4.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}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\ifmmode\pm\else\textpm\fi{}1.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11} and 0.92{c}_{(TY)}+0.40{c}_{(TZ)}=(2.6\ifmmode\pm\else\textpm\fi{}5.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11} in the standard model extension framework [D. Colladay, V. A. Kosteleck\'y, Phys. Rev. D. 58, 116002 (1998)].References(0)
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