Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Posters: Quantum Optics and Photonics III

Q 39.5: Poster

Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof

Spin squeezing can only improve clocks with small atom number — •Marius Schulte¹, Christian Lisdat², Piet O. Schmidt^2,3, Uwe Sterr², and Klemens Hammerer¹ — ¹Institute for Theoretical Physics and Institute for Gravitational Physics (Albert-Einstein-Institute), Leibniz University Hannover — ²Physikalisch-Technische Bundesanstalt (PTB), Braunschweig — ³Institute for Quantum Optics, Leibniz University Hannover

We show that the stability of an optical atomic clock can not be improved by spin squeezed states for ensembles above a critical particle number as in this case, the optimum stability is completely determined by the noise and the limited coherence time of the interrogation laser. Our results apply to the common case of cyclic Ramsey interrogations on a single atomic ensemble with dead time between each measurement. The combination of analytical models for projection noise, dead time noise (Dick effect) and laser phase noise allows quantitative predictions of the critical particle number and the optimal clock stability for a given dead time and laser noise. Our analytical predictions are confirmed by numerical simulations of the closed servo loop of an optical atomic clock. This work was supported by SFB 1227 `Dq-mat'. arXiv:1911.00882