Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster: Quantum Optics and Photonics III
Q 57.22: Poster
Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik
Progress Towards an Al+ Quantum Logic Optical Clock — •Johannes Kramer1,2, Nils Scharnhorst1,2, Nicolas Spethmann1, Ludwig Krinner1, Javier Cerrillo3, Ian D. Leroux1, Alex Retzker4, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, D — 2Leibniz Universität Hannover, 30167 Hannover, D — 3Technische Universität Berlin, 10623 Berlin, D — 4The Hebrew University of Jerusalem, 91904 Jerusalem, IL
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 quantum logic schemes for state readout. 27Al+ provides a suitable clock transition and favorably low sensitivity to external field shifts. 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 as a 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]. Extrapolating from these results, we expect a fractional second order Doppler shift from residual motion of an Al+/Ca+ crystal of well below 10−18. Progress towards quantum logic spectroscopy of Al+ will be presented. [1] Scharnhorst et al., Phys. Rev. A 98, 023424 (2018)