SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.37: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Variational Clock Protocols — •Timm Kielinski — Institute for theoretical physics, Hannover, Germany

Enhancement of clock stability beyond the classical limit can be accomplished by introducing entanglement between the atoms. In particular, one-axis-twisting (OAT) interactions receive much attention since they give enhanced sensitivity by generating squeezed spin states or echo protocols and can be reliably implemented in several experimental setups. In local (frequentist) phase estimation, the sensitivity is characterized using tools as the Fisher information and is limited by the Cramér Rao bound. However, laser noise limits the clock stability and therefore frequency fluctuations during the clock operation have to be considered. To accomplish for the finite prior information, Bayesian phase estimation is applied representing the trade-off between reduction in quantum projection noise (QPN) and the coherence time limit (CTL) of the laser. This work aims to optimize the stability of ion clocks building on a variational class of Ramsey protocols. Theoretical predictions are validated by numerical simulations of the full feedback loop of an atomic clock. The main limitation is imposed by fringe hops, especially in the presence of dead time.