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A: Fachverband Atomphysik
A 29: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
A 29.5: Vortrag
Freitag, 10. März 2023, 12:15–12:30, F303
An optical atomic clock based on correlation measurements of a two ion 40Ca+ crystal — •Kai Dietze1,2, Ludwig Krinner1,2, Lennart Pelzer1, Fabian Dawel1,2, Johannes Kramer1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany
Trapped ion optical clocks reach high relative frequency accuracies but are often limited by quantum projection noise in their statistical uncertainty, thus requiring long averaging times. The statistical uncertainty can be reduced by increasing the number of ions and/or probing the ion(s) for a longer time with the clock laser. By extending the measurement to entangled states the statistical uncertainty can even surpass the quantum projection noise of classical interrogation protocols [1]. In our scheme classically and quantum correlated quantum states of a two-ion 40Ca+ crystal are prepared in a so-called decoherence-free substate (DFS), which is insensitive to linear magnetic field fluctuations [2]. We present the results of these correlation measurements within the DFS, showing near lifetime limited coherence times. Furthermore, we demonstrate the stabilization of our clock laser using these classically correlated states. First steps towards the utilization of entangled states prepared with a Cirac-Zoller gate and the integration in the measurement protocol will be shown.
[1] E.M. Kessler et al., PRL 112, 190403 (2014)
[2] C. Roos et al., Nature 443, 316319 (2006)