Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 52: Quantum Dynamics, Decoherence and Quantum Information

DY 52.10: Talk

Thursday, March 19, 2020, 17:30–17:45, HÜL 186

Extended coherently delocalized states in a frozen gas — Ghassan Abumwis, Matthew T. Eiles, and •Alexander Eisfeld — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany

The long-range dipole-dipole interaction between excited states of atoms can create highly delocalized states due to the exchange of excitation between the atoms. We show that even in a random gas many of the single-exciton eigenstates are surprisingly delocalized, composed of roughly one quarter of the participating atoms. We identify two different types of eigenstates: one which stems from strongly-interacting clusters, resulting in localized states, and one which extends over large delocalized networks of atoms. These two types of states can be excited and distinguished by appropriately tuned electromagnetic pulses.