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Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.41: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

Towards a transportable 27Al+ quantum logic optical clock — •Lennart Pelzer1, Stephan Hannig1, Mariia Stepanova1, Johannes Kramer1, Nils Scharnhorst1, Nicolas Spethmann1, and Piet O. Schmidt1,21Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany

According to Einstein’s theory of relativity, optical clocks tick slower near a gravitating body. On Earth, this corresponds to a fractional frequency change of 10−17 for 10 cm height difference. Clock comparisons via length-stabilized optical fibers thus enable height difference measurements over long distances, realizing ”relativistic geodesy” with clocks. Such measurements complement classical techniques base on spirit leveling or a combination of gravimetry and satellite positioning.

We present the status of our 27Al+/ 40Ca+ quantum logic optical clock. An Al+ ion serves as the clock ion with a narrow (8mHz) transition at 267nm which is insensitive to electromagnetic line shifts. The single Al+ ion is confined together with a single Ca+ ion. The latter is used for sympathetic cooling to the ground state as well as the readout of the clock transition. We present a transportable setup in which many optics components are fiber-coupled. Using ablation loading we can trap single Ca+ ions in a segmented linear Paul trap with low heating rate and small black-body radiation shift. We present first results on ground state cooling and trap characterization. The setup will be transferred into a container to demonstrate relativistic geodesy at a level of 10 cm and below.

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