Saving Entanglement via a Nonuniform Sequence of $\pi$ Pulses

Abstract

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.

5 pages, 3 figures

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• Spin-echo entanglement protection from random telegraph noise
• Experimental protection of arbitrary states in a two-qubit subspace by nested Uhrig dynamical decoupling
• Dynamical Decoupling in Common Environment
• Remote Cooling of Spin-ensembles through a Spin-mechanical Hybrid Interface
• Modified coherence of quantum spins in a damped pure-dephasing model
• Filter-design perspective applying to dynamical decoupling of a multi-qubit system