Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.40: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
Progress Towards an Al+ Quantum Logic Optical Clock — Nils Scharnhorst1,2, •Johannes Kramer1, Ian D. Leroux1, Nicolas Spethmann1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
We present the status of our aluminum ion optical clock, based on a single 27Al+ clock ion confined in a linear Paul trap together with a 40Ca+ logic ion. The latter is used for sympathetic cooling and internal state detection of the clock ion via the Coulomb interaction. 27Al+ provides a narrow (8 mHz) clock transition at 267 nm which exhibits negligible electric quadrupole shift and an exceptionally low sensitivity to black-body radiation. A measurement of the trap temperature combined with numerical simulations allows us to bound the black-body radiation shift to < 10−19. Micromotion has been compensated to a level well below a fractional frequency uncertainty of 10−17. We developed double-bright electromagnetically induced transparency (D-EIT) cooling [1] as novel scalable approach to standard EIT cooling. Using the D-EIT scheme we demonstrated for the first time ground-state cooling of all three motional degrees of freedom of a trapped 40Ca+ ion within a single, short cooling pulse [1]. Our next step is to extend this technique to ground-state cooling of all six motional modes of an Al-Ca crystal. Extrapolating from the results of a single Ca+ cooling, we expect a fractional second order Doppler shift from residual motion of well below 10−18. [1] Scharnhorst et al., arXiv: 1711.00732v2 (2017)