Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Transport: Quantum Coherence and Quantum Information

TT 44.1: Vortrag

Donnerstag, 26. März 2009, 14:00–14:15, HSZ 304

Entanglement in driven spin chains — •David Zueco, Fernando Galve, Sigmund Kohler, and Peter Hänggi — Institut für Physik, Universität Augsburg, Universitätsstraße 1, D-86135 Augsburg, Germany

One-dimensional spin chains are ubiquitous in condensed matter physics and represent one of the basic models in quantum information. Therefore, insight to their behavior is rather valuable and, eventually, allows the development of methods for controlling their dynamics. Among a variety of tasks, the directed transfer of quantum entanglement through the chain presents an important challenge. In this sense we could use them as “quantum wires” pretty much like copper wires carrying electrons in the electrical circuits.

In this talk we present our recent results on the generation and control of entanglement dynamics in 1D driven spin chains. We demonstrate the feasibility of generating entanglement between the first and the last spin of a chain via applied time-dependent fields [1]. Moreover, once the entanglement has been created, the driving even allows further control of its dynamics. In particular we propose guiding entanglement into a direction of choice, which corresponds to a rectification of quantum information transfer. Finally, we will discuss how to quench the dynamics in order to preserve the entanglement during a substantial time interval.

[1] F. Galve, D. Zueco, S. Kohler, E. Lutz, and P. Hänggi arXiv:0809.3712