Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.10: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Correlated Quantum Dynamics of a Single Atom Collisionally Coupled to an Ultracold Finite Bosonic Ensemble — Sven Krönke1, •Johannes Knörzer1, and Peter Schmelcher1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging
We explore the correlated quantum dynamics of a single atom with a spatio-temporally localized coupling to a finite bosonic ensemble. The single atom is initially prepared in a coherent state and oscillates in a one-dimensional harmonic trap. An ensemble of NA interacting bosons is trapped in a separated harmonic potential. The ensemble is periodically penetrated by the single atom. The non-equilibrium quantum dynamics of the total system is simulated by means of an ab-initio method. In this poster presentation, we focus on characterizing the impact of the spatio-temporally localized inter-species coupling and the thereby induced inter-species correlations on the states of the single atom and the finite bosonic ensemble. With increasing NA, we observe an accelerated inter-species energy transfer due to a level splitting induced by inter-species interactions. The ensemble mainly features singlet and doublet excitations and a delayed emergence of doublets is observed for which we offer analytical insights with a stroboscopic time-dependent perturbation theory. At instants of not too imbalanced energy distribution among the subsystems, inter-species correlations prove to be significant. We relate those instants to the coherence of the single atom quantum state indicating that correlated energy transfer dynamics manifests itself in temporal losses of its coherence.