Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology (Optical Clocks)
Q 14.2: Vortrag
Montag, 11. März 2019, 14:30–14:45, S SR 111 Maschb.
Characterization of a transportable aluminum ion quantum logic optical clock setup — •Stephan Hannig1, Lennart Pelzer1, Johannes Kramer1, Mariia Stepanova2, Nicolas Spethmann1, Tanja E. Mehlstäubler1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany
We present the status of a setup for an aluminum ion optical clock in which a co-trapped calcium ion is used for sympathetic cooling and readout.
A transportable hardware package including a segmented multi-layer trap, a compact titanium vacuum chamber, a near-diffraction-limited imaging system with high numerical aperture based on a single biaspheric lens, and an all-in-fiber 40Ca+ repump laser system is presented. The trap-induced frequency shifts on 27Al+ have been derived from measurements with a single 40Ca+ ion. We determined the micromotion-induced second-order Doppler shift and the black-body radiation shift for 27Al+ with uncertainties below 10−18. Currently, the largest contribution is estimated to arise from background gas collisions to 1.5×10−18. Moreover, heating rates of less than 10 quanta per second have been measured for all three motional modes at trap frequencies of ωrad,Ca+≈2π×2.5 MHz (ωax,Ca+≈2π×1.5 MHz). Furthermore, we show first results on ablation loading of 27Al+ using photo-ionization.