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A: Fachverband Atomphysik
A 3: Precision Spectroscopy of atoms and ions I (joint session A/Q)
A 3.6: Vortrag
Montag, 11. März 2019, 11:45–12:00, S HS 2 Physik
Towards a 171Yb+ single-ion frequency standard in the 10-19 uncertainty range — •Richard Lange1, Nils Huntemann1, Christian Sanner1,2, Jiehang Zhang1, Moustafa Abdel Hafiz1, Hu Shao1, Christian Tamm1, and Ekkehard Peik1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2present address: JILA, Boulder, CO 80309, USA
Two 171Yb+ single-ion traps are employed in our laboratory and realize optical clocks based on the 2S1/2 → 2D3/2 electric quadrupole (E2) [PRA 89, 023820] and the 2S1/2 → 2F7/2 electric octupole (E3) [PRL 108, 090801] reference transitions. For the E3 transition, which is less prone to external perturbations, a frequency uncertainty of 3 × 10−18 has recently been evaluated and demonstrated in a long-term comparison between two independent clock setups [arXiv:1809.10742]. The achieved uncertainty was essentially limited by trap imperfections, which will be further reduced with an improved ion trap design.
We will discuss the dominant contributions to the present uncertainty and show the advantages of the new trap design, e.g. low loss insulators causing smaller blackbody radiation (BBR) shift, polished gold-coated electrodes for low heating rates and large optical access for rigorous minimization of excess micromotion. In combination with a more precise measurement of the scalar differential polarizability for a precise correction of the BBR shift, the new clock setup is expected to reach an uncertainty below 10−18.