Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.9: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Evaluating the performance of cascaded atomic clocks — •Marius Schulte1, Piet O. Schmidt2,3, and Klemens Hammerer1 — 1Institut für theoretische Physik und Institut für Gravitationsphysik (Albert Einstein Institut), Leibniz Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 3Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
A fundamental challenge for optical clocks is given by the noise properties of their local oscillator. Increasing the interaction time with the atomic reference allows to make more precise estimates on the frequency error and better corrections in the clock operation, however this is only true as long as the phase between local oscillator and reference can be uniquely measured. In this way atomic clocks with e.g. Ramsey interrogation have maximal interrogation times which are set by the noise strength of the local oscillator and limit their long term stability [1]. Cascaded clocks with multiple atomic ensembles were proposed to overcome this limitation [2]. Here we perform numerical analysis of such protocols, finding optimised servo controllers as well as reviewing the maximal interrogation times and long term stability.
[1] Leroux, I. D., et al., On-line estimation of local oscillator noise and optimisation of servo parameters in atomic clocks, Metrologia 54.3 (2017) [2] Borregaard, J. and Sørensen, A. S., Efficient atomic clocks operated with several atomic ensembles, Phys. Rev. Lett. 111, 090802 (2013)