Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.79: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
The 87Sr Strontium Lattice Clock at PTB — •A. Al-Masoudi, St. Falke, S. Häfner, St. Vogt, U. Sterr, and C. Lisdat — Physikalisch-Technische Bundesanstalt (PTB); Bundesallee 100; 38116 Braunschweig
Optical clocks have been quickly moving to the forefront of the frequency standards due to high spectral resolution, and therefore high potential stability and accuracy. One envisioned application of optical clocks is to perform tests fundamental physics with high accuracy. Sr optical clocks have a significant frequency shift due to blackbody radiation. We will control this effect by interrogating the 87Sr atoms in an environment of well controlled temperature. This produces a well characterized BBR field that allows together with a precisely known atomic reaction to the field for a high accuracy correction of the BBR shift. Another effect, which can play a significant role in the lattice clock accuracy budget, is the dc Stark shift due to stray or patch fields. We measured the residual electric field by measuring the shift of the transition frequency as a function of an additional electric field. The dc Stark shift is proportional to the total electric field squared and the stray field can be inferred from the parabola offset. Applying three different fields, the total dc electric field was derived, which corresponded to a fractional shift of 3×10−19. By field compensation, this approach allows for control of this effect at a level of 10−19. This work is supported by QUEST, DFG (RTG 1729), and the EMRP in IND14, ITOC, and QESOCAS. The EMRP is jointly funded by the EMRP participating countries within EURAMET and European Union.