Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster: Quantum Optics and Photonics III
Q 57.24: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik
A robust clock transition on 40Ca+ with a continuous dynamical decoupling scheme — •Kai Dietze1, Lennart Pelzer1, Nati Aharon2, Nicolas Spethmann1, Alex Retzker2, and Piet O. Schmidt1,3 — 1Physikalisch Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904 — 3Leibniz Universität Hannover, 30167 Hannover, Germany
Dynamical decoupling is a promising approach for protecting an optical clock transitions against dominant environmental shifts. By applying continuous radio frequency (rf) fields, we generate a decoherence-free subspace with largely suppressed field shifts. In particular, it is possible to remove inhomogeneous line shifts in large crystals of ions, enabling the operation of an optical frequency reference with many ions and correspondingly reduced statistical uncertainty. We present predictions and limitations for the achievable linewidths and residual shifts, using this scheme [1]. In first experiments spectroscopic measurements for a trapped 40Ca+ ion were performed for which the 4 S1/2 and the 5D5/2 Zeeman states were dressed, resulting in a reduction of linewidth broadening of the 729 nm clock transition by one order of magnitude. Additionally we evaluate the suppression of magnetic field shifts for this single stage dressing approach. The final scheme will involve four rf fields to realize doubly-dressed states, protecting the system against power fluctuations of the first driving fields, Zeeman-, quadrupole-, and tensor ac-Stark shifts from the rf driving field of the Paul trap.
[1] Aharon et al., arXiv:1811.06732v1