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Q: Fachverband Quantenoptik und Photonik

Q 67: Quanteneffekte: Verschränkung und Dekohärenz 2

Q 67.8: Vortrag

Freitag, 16. März 2012, 15:45–16:00, V7.01

Robust entanglement production based on Rubin’s one-dimensional crystal — •Endre Kajari¹, Alexander Wolf¹, Eric Lutz^2,3, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, D-66041 Saarbrücken, Germany — ²Department of Physics, University of Augsburg, D-86135 Augsburg, Germany — ³Institut für Theoretische Physik, Freie Universität Berlin, D-14195 Berlin, Germany

Rubin’s model provides a microscopic description for the dynamics of thermalization of a defect particle embedded in a one-dimensional crystal [1]. Under certain conditions, the crystal acts as a reservoir and pulls the defect into a thermal state at the temperature of the harmonic chain. In a recent paper [2], we showed how a reservoir like the one of Rubin can support the creation of entanglement between two defects (even when it acts as thermal reservoir for a single defect). In this talk, we give a detailed discussion of the conditions that have to be met for the generation of this steady-state entanglement. In particular, we identify two mechanisms that give rise to entanglement. We quantify the steady-state entanglement by means of the logarithmic negativity and examine in detail its dependence on the initial states of the defects and the reservoir, as well as on the parameters of the underlying microscopic model.
R. J. Rubin, Phys. Rev. 131, 964 (1963).
A. Wolf, G. de Chiara, E. Kajari, E. Lutz and G. Morigi, EPL 95, 60008 (2011).