Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster II
Q 55.47: Poster
Donnerstag, 11. März 2010, 16:00–19:00, Lichthof
Entanglement dynamics of three-qubit states in noisy channels — •Michael Siomau1 and Stephan Fritzsche2,3 — 1Max-Planck-Institut fuer Kernphysik, Postfach 103980, D-69117 Heidelberg, Germany — 2Department of Physical Sciences, P.O.Box 3000, Fin-90014 University of Oulu, Finland — 3Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
The implementation of schemes for quantum teleportation requires the quantification of entanglement for states that, in general, are mixed due to the interaction with the environment. We study the entanglement dynamics of three-qubit GHZ and W states under the influence of the environment. As noise models for the influence of the environment we use σz, σx and σy Pauli as well as the depolarizing channel [1]. The entanglement of the states is quantified with the lower bound to the three-qubit concurrence [2]. We show that the GHZ state preserves more entanglement than the W state in transmission through σx and σy Pauli and the depolarizing channels. For σz Pauli channel, in contrast, the W state preserves more entanglement than the GHZ state.
[1] E. Jung et al. Phys. Rev. A 78, 012312 (2008).
[2] M. Li, S.-M. Fei, Z.-X. Wang, J. Phys. A 42, 145303 (2009).