Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Ultracold Plasmas and Rydberg Systems II (joint session Q/A)
A 15.1: Vortrag
Montag, 5. März 2018, 16:15–16:30, K 2.013
Metastable decoherence-free subspaces and electromagnetically induced transparency in interacting many-body systems — •Katarzyna Macieszczak1,2, YanLi Zhou3, Sebastian Hofferberth4, Juan P. Garrahan1,2, Weibin Li1,2, and Igor Lesanovsky1,2 — 1School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD, United Kingdom — 2Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham NG7 2RD, United Kingdom — 3College of Science, National University of Defense Technology, Changsha 410073, China — 4Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense, Denmark
We investigate the dynamics of a generic interacting many-body system under conditions of electromagnetically induced transparency (EIT). This problem is of current relevance due to its connection to nonlinear optical media realised by Rydberg atoms. In an interacting system the structure of the dynamics and the approach to stationarity become far more complex than in the case of conventional EIT as a metastable decoherence-free subspace emerges, whose dimension for a single Rydberg excitation grows linearly in the number of atoms. We discuss the effective slow nonequilibrium dynamics, which features coherent and dissipative two-body interactions, and renders the typical assumption of fast relaxation invalid. We also show how this scenario can be utilised for the preparation of collective entangled dark states and the realisation of general unitary dynamics within the spin-wave subspace.