Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 66: Poster: Entanglement
FM 66.8: Poster
Wednesday, September 25, 2019, 16:30–18:30, Tents
Entangled optical clock states in 40Ca+ — •Ludwig Krinner1, Kai Dietze1, Lennart Pelzer1, Stephan Hannig1, Nicolas Spethmann1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany
Single ion optical clocks are limited in their statistical uncertainty by quantum projection noise. Increasing the number of ions while maintaining low systematic uncertainties is demanding. In such a situation, entangling atoms on an optical transition can improve the statistical uncertainty. Furthermore, using especially engineered quantum states, the transition can be made free of the linear Zeeman shift. We present in this poster progress towards preparing a pair of 40Ca+ ions in a decoherence free entangled subspace, which is both robust against magnetic field fluctuations and allows shorter interrogation times for a given stability (compared to two uncorrelated ions). We present first results on a successful implementation of Mølmer Sørensen entangling gates and discuss possible avenues of reaching the decoherence free subspace.