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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Effects: Entanglement and Decoherence II

Q 17.1: Vortrag

Dienstag, 24. März 2015, 11:00–11:15, B/gHS

Quantum-to-classical transition in disordered media — •Clemens Gneiting¹, Felix Anger¹, and Andreas Buchleitner^{1, 2} — ¹Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg — ²Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstr. 19, 79104 Freiburg

The problem of single- and many-particle transport through disordered media lies at the heart of a multitude of physical processes. A prominent consequence of disorder is that the propagation of particles exhibits interference-induced phenomena such as Anderson localization. We investigate how this transition into localized asymptotic states takes place. In particular, we focus on single- and many-particle coherence properties and their evolution in the ensemble average. We find that, upon averaging over the disorder realization, the effective time evolution of arbitrary initial states exhibits a dephasing process towards their Anderson-localized asymptotic limit, for instance indicated by the decreasing visibility of an interference pattern. We characterize this dephasing process for the case of a single and two particles in a discrete lattice with disorder and different initial states.