Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 64.18: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Artificial clock transitions with trapped 40Ca+ ions. — •Kai Dietze1,2, Lennart Pelzer1,2, Ludwig Krinner1,2, Fabian Dawel1,2, Johannes Kramer1,2, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30157 Hannover, Germany
State-of-the-art optical atomic clocks based on trapped ions achieve unprecedented precision but often require long averaging times to reduce the statistical uncertainty, compared to neutral atom clocks.
The measurement uncertainty is usually limited by the quantum projection noise. It can be reduced by either extended probe times with the clock laser and/or simultaneous probing of multiple ions.
By employing interrogation schemes that create a decoherence free subspace (DFS) against frequency shifts on the clock transitions, the effects of external noise and transition broadening, common in multi-ion systems, can be mitigated.
We demonstrate a continuous dynamical decoupling sequence engineering a the clock transition in 40Ca+ to be insensitive against magnetic field noise and the quadrupole shift, making the simultaneous probing of multiple ions feasible [1].
Additionally, we present our experimental results of a frequency reference based on two entangled ions within a DFS, achieving near-lifetime-limited interrogation times and surpassing the sensitivity limits of uncorrelated measurement protocols.
[1] L. Pelzer et al., PRL 133, 033203 (2024)
Keywords: Optical atomic clocks; Trapped ions; Decoherence free subspaces