Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Precision Spectrosocopy III - trapped ions (joint session A/Q)
Q 23.5: Vortrag
Montag, 5. März 2018, 17:30–17:45, K 1.016
Test of the isotropy of space with a high-precision long-term comparison of two single-ion optical clocks — •Richard Lange, Christian Sanner, Nils Huntemann, Burghard Lipphardt, Christian Tamm, and Ekkehard Peik — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
We employ two 171Yb+ single-ion optical frequency standards that differ significantly with respect to trap geometry, control software and interrogation sequence. The clock frequency is determined by the 2S1/2 → 2F7/2 electric octupole (E3) transition. The relative systematic uncertainty of the clocks has been evaluated to less than 4× 10−18 [PRL 108, 090801 (2016)]. In a long-term comparison of the two clocks for a period of seven month with a duty cycle of up to 95 % per day, we found an agreement of the clock frequencies within the systematic uncertainty. Due to the electronic structure of the 2F7/2 state, the E3 transition frequency is very sensitive to violations of Local Lorentz Invariance (LLI) [Nature Physics 12, 465 (2016)]. In our experiment, this violation would manifest itself in a modulation of the clocks’ frequency difference caused by the rotation of the earth in space. Analyzing our long-term data with millihertz resolution, we improve the current limits of violations of LLI in the electron sector by a factor of 100.