Saving Entanglement via a Nonuniform Sequence of $π$ Pulses

Details Saving Entanglement via a Nonuniform Sequence of $π$ Pulses Saving Entanglement via a Nonuniform Sequence of $π$ Pulses

2009-11-21

arxiv.org/abs/0911.4158v2

Phys. Scr. 82 (2010) 038103

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

We examine the question of survival of quantum entanglement between the bipartite states and multiparticle states like GHZ states under the action of a dephasing bath by the application of sequence of $\pi$ pulses. We show the great advantage of the pulse sequence of Uhrig [ 2007 {\it Phys. Rev. Lett.} {\bf 98} 100504] applied at irregular intervals of time, in controlling quantum entanglement. In particular death of entanglement could be considerably delayed by pulses. We use quantum optical techniques to obtain exact results.

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