Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quanteneffekte: Dekohärenz
Q 60.5: Talk
Friday, March 6, 2009, 11:30–11:45, VMP 6 HS-D
Decoherence of multiparticle entanglement — •Otfried Gühne1, Fabian Bodoky2, and Miriam Blaauboer2 — 1Inst. für Quantenoptik und Quanteninformation, ÖAW, A-6020 Innsbruck — 2Kavli Institute of Nanoscience, Delft University of Technology, NL-2628 CJ Delft
Decoherence of quantum states is a fundamental obstacle for implementations of quantum information processing. Therefore, it is interesting to know how the entanglement of a multiparticle quantum state is affected by decoherence and how this depends on the state and the number of qubits. This is, however, difficult to investigate, since most entanglement measures are practically impossible to compute for mixed states.
In this contribution we present a method to determine the decay of quantum correlations as quantified by the geometric measure of entanglement under the influence of decoherence. With this, one can compare the robustness of entanglement in GHZ, cluster, W and Dicke states of four qubits and show that the Dicke state is most robust. Furthermore, the method allows to compare different decoherence models and to investigate the scaling of the entanglement decay for an increasing number of particles.