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A: Fachverband Atomphysik

A 29: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)

A 29.6: Vortrag

Freitag, 10. März 2023, 12:30–12:45, F303

Progress of the ¹⁷¹Yb⁺ single-ion optical clocks at PTB — •jian jiang, martin steinel, melina filzinger, ekkehard peik, and nils huntemann — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Clocks based on optical reference transitions of single ions confined in radio-frequency traps or neutral atoms trapped in optical lattices are the most accurate measurement devices ever built. The ²S_1/2(F=0) → ²F_7/2(F=3) electric octupole transition of a single trapped ¹⁷¹Yb⁺ ion is employed as the reference in our case. In this talk, we report on an improved end-cap ion trap with low-loss insulator material and high thermal conductivity to obtain a homogeneous temperature distribution. A thick gold coating of the electrodes should lead to a low ion heating rate, and a precise evaluation of shifts from residual fields promises a total uncertainty below 1× 10⁻¹⁸. For the latter, we make use of the ²S_1/2(F=0) → ²D_3/2(F=2) electric quadrupole transition of the same ion. This transition can also be used to efficiently cool the ion to the motional ground state and suppress corresponding Doppler shifts.