Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster Session - Atomic Physics II
A 14.23: Poster
Tuesday, March 10, 2020, 16:00–18:00, Empore Lichthof
Designed quantum states for 40Ca+ clock interrogation — •Lennart Pelzer1, Kai Dietze1, Ludwig Krinner1,2, Stephan Hannig1,3, Nicolas Spethmann1, Nati Aharon4, Alex Retzker4, Tanja E. Mehlstäubler1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany — 3DLR-Si, 30167 Hannover, Germany — 4Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Single ion optical clocks are limited in their statistical uncertainty by quantum projection noise. Stabilizing the interrogation laser to a transition in a multi-ion crystal would allow longer probe times and thus improve statistical uncertainty, but increasing the number of ions while maintaining low systematic uncertainties is demanding.
Using engineered quantum states by employing a continuous dynamical decoupling scheme, all relevant frequency shifts in a 40Ca+ ion-crystal get suppressed. Furthermore, entangling atoms on an optical transition can improve the statistical uncertainty as well as the systematic uncertainty by engineering entangled states that are e.g. free of the linear Zeeman shift.
We present progress on tailoring a robust clock transition by dressing both Zeeman manifolds of the S1/2 to D5/2 transition with four driving RF-fields as well as first results on entangling two Ca+ ions using a Mølmer-Sørensen gate.