SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantum Information (joint session QI/Q)
Q 11.3: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Tailored Optical Clock Transition in 40Ca+ — •Lennart Pelzer1, Kai Dietze1, Johannes Kramer1, Fabian Dawel1, Ludwig Krinner1,2, Nicolas Spethman1, Victor Martinez2, Nati Aharon3, Alex Retzker3, Klemens Hammerer2, and Piet Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, — 3Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Optical clocks based on single trapped ions are often impeded by long averaging times due to the quantum projection noise limit. Longer probe time would improve the statistical uncertainty, but currently, phase coherence of clock laser systems is limiting probe times for most clock candidates. We propose pre-stabilization of the laser to a larger 40Ca+ ion crystal, offering a higher signal-to-noise ratio. We engineer an artificial optical clock transition with a two stage continuous dynamical decoupling scheme, by applying near-resonant rf dressing fields. The scheme suppresses inhomogeneous tensor shifts as well as the linear Zeeman shift, making it suitable for multi-ion operation. This tailored transition has drastically reduced magnetic-field sensitivity. Even without any active or passive magnet-field stabilization, it can be probed close to the second-long natural lifetime limit of the D5/2 level. This ensures low statistical uncertainty. In addition, we show a significant suppression of the quadrupole shift on a linear five-ion crystal by applying magic angle detuning on the rf-drives.