Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Präzisionsmessungen und Metrologie 3
A 7.3: Vortrag
Montag, 12. März 2012, 17:00–17:15, V7.03
Optical Frequency Transfer via 920 km Fiber Link with 10−19 Relative Accuracy — •Stefan Droste1, Katharina Predehl1,2, Janis Alnis1, Theodor W. Hänsch1, Thomas Udem1, Ronald Holzwarth1, Sebastian M. F. Raupach2, Osama Terra2, Thomas Legero2, Harald Schnatz2, and Gesine Grosche2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Since optical clocks have surpassed the performance of the best microwave clocks they are considered for a possible redefinition of the second. One prerequisite for a future redefinition is the ability to com-pare optical frequencies at a high level of stability and accuracy. Optical fiber links have been investigated and considered to serve this purpose. We established a fiber connection between the two institutes Max-Planck-Institute of Quantum Optics (MPQ) in Garching and the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. We measured the stability of the frequency transfer to 3.8 x 10−14 at 1 s reaching 4 x 10−18 after 103 s of integration time. We further calculated the deviation of the expected value and the statistical uncertainty to (0.7 ± 3.6) x 10−19. We can therefore constrain any possible frequency deviation between the local and the far end of the fiber link to be smaller than 3.6 x 10−19. The demonstrated frequency transfer over an optical fiber link exceeds the requirements for a comparison of todays most accurate clocks by more than one order of magnitude.