Entanglement dynamics of three-qubit states in noisy channels

Details Entanglement dynamics of three-qubit states in noisy channels Entanglement dynamics of three-qubit states in noisy channels

2010-02-16

arxiv.org/abs/1002.3064v2

M.Siomau and S.Fritzsche, Eur. Phys. J. D 60, 397 (2010)

Physics

Quantum Physics

2 figures, 32 references

Scientific paper

10.1140/epjd/e2010-00189-1

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 $\sigma_z, \, \sigma_x, \, \sigma_y$ 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 $\sigma_z$. For the Pauli channels $\sigma_x, \, \sigma_y$ 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.

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