https://doi.org/10.1140/epjd/e2010-00189-1
Entanglement dynamics of three-qubit states in noisy channels
1
Max-Planck-Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
2
Physikalisches Institut, Heidelberg Universität, 69120 Heidelberg, Germany
3
Department of Physical Sciences, P.O. Box 3000, University of Oulu, 90014 Oulu, Finland
4
GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
Corresponding author: a siomau@physi.uni-heidelberg.de
Received:
12
April
2010
Revised:
14
June
2010
Published online:
27
July
2010
We study entanglement dynamics of the three-qubit system
which is initially prepared in pure Greenberger-Horne-Zeilinger
(GHZ) or W state and transmitted through one of the Pauli channels
,
,
or the depolarizing channel.
With the help of the lower bound for three-qubit concurrence we show
that the W state preserves more entanglement than the GHZ state in
transmission through the Pauli channel
. For the Pauli
channels
,
and the depolarizing channel,
however, the entanglement of the GHZ state is more resistant against
decoherence than the W-type entanglement. We also briefly discuss
how the accuracy of the lower bound approximation depends on the
rank of the density matrix under consideration.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010