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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Information: Concepts and Methods 1
Q 7.3: Talk
Monday, March 14, 2011, 11:00–11:15, SCH A118
Evolution equation of entanglement for multi-qubit systems — •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
Typically, the time evolution of entanglement of a system is deduced from studying its state evolution under the influence of decoherence. Instead of making explicit use of the state evolution for the analysis of the entanglement dynamics of a given system, Konrad et al. [1] recently derived an evolution equation of entanglement for a two-qubit system that provides a direct relationship between the initial and the final entanglement of the system when one of its qubits is subjected to an arbitrary noise. We have extended this concept towards multi-qubit systems under the same assumption that just one of the qubits undergoes the action of a noisy channel. In this contribution, we suggest and discuss an evolution equation of entanglement for a lower bound for multi-qubit concurrence [2].
[1] T.Konrad et al., Nature Phys. 4, 99 (2008).
[2] M.Siomau and S.Fritzsche, arXiv:1011.5348v1.