Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.1: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Entanglement dynamics of multi-qubit states in single- and many-sided noisy channels — •Michael Siomau1,2 and Stephan Fritzsche3,4 — 1Max-Planck-Institut fuer Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany — 2Physikalisches Institut, Heidelberg Universitaet, D-69120 Heidelberg, Germany — 3Department of Physical Sciences, P.O.Box 3000, Fin-90014 University of Oulu, Finland — 4GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt, Germany
We study the entanglement dynamics of a multi-qubit system which is initially prepared in a GHZ or a W state and undergoes the action of some noisy channel. We discuss both cases of single- and many-sided noisy channels, i.e. when just one or several qubits simultaneously being subject to local noise. As noise models for the influence of the environment we use the Pauli channels σx, σy and σz. The entanglement of the (mixed) states is quantified with a lower bound for multi-qubit concurrence as suggested recently by Li et al. [J. Phys. A 42, 012312 (2009)]. We show that for a single-side channel, the loss of the entanglement of the multi-qubit system is independent on the initial state and the type of acting noise. For many-sided channels, however, there is a difference in the “speed of disentanglement” between the GHZ and the W states which, moreover, depends on the type of coupling noise.