Saving entanglement via a nonuniform sequence of π pulsesMaterial presented in the lecture at the International Conference ‘Quantum Nonstationary Systems’, at Brasilia, Brazil, October 2009.
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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 a sequence of π pulses. We show the great advantage of the pulse sequence of Uhrig (2007 Phys. Rev. Lett. 98 100504) applied at irregular intervals of time in controlling quantum entanglement. In particular, the death of entanglement could be considerably delayed by pulses. We use quantum optical techniques to obtain exact results. © 2010 The Royal Swedish Academy of Sciences.
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