Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.19: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Trapped-atom interferometry with losses — •Valentin Ivannikov — Swinburne University of Technology, Centre for Atom Optics and Ultrafast Spectroscopy, Australia — Physikalisches Institut, Universität Heidelberg, Germany

An ensemble density matrix model that includes one- and two-body losses is derived for a trapped-atom clock. A trapped-atom clock is mainly affected by one- and two-body losses, generally giving non-exponential decays of populations; nevertheless, three-body recombination is also quantitatively analyzed to demonstrate the boundaries of its practical relevance. The importance of one-body losses is highlighted without which population trapping behaviour would be observed. The model is written with decay constants expressed through experimental parameters. It can complement, e.g., the ISRE (identical spin rotation effect) model to improve its predictions: ISRE dramatically increases the ensemble coherence time, hence it enables one to observe the influence of two-body losses on the interferometry contrast envelope. The presented model is useful for Ramsey interferometry and is ready for immediate experimental verification in existing systems.

In addition, several Ramsey-type interferometry models are presented which include one-body and few-body losses. A way to include ensemble-phase noise to the many-body model due to the rotational property of the Ramsey detection pulse is suggested to avoid the computational complexity of the Markovian simulation.