Issue
EPL
Volume 83, Number 3, August 2008
Article Number 30009
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/83/30009
Published online 28 July 2008
EPL, 83 (2008) 30009
DOI: 10.1209/0295-5075/83/30009

Entanglement sudden death and its controlled partial resuscitation

G. Gordon

Department of Chemical Physics, Weizmann Institute of Science - Rehovot 76100, Israel

mail@gorengordon.com

received 1 May 2008; accepted in final form 20 June 2008; published August 2008
published online 28 July 2008

Abstract
Entanglement is very susceptible to decoherence and can rapidly decay or even completely disappear in finite time. A universal dynamical control of the disentanglement approach is presented, whereby one locally modulates entangled systems weakly coupled to thermal baths. We show that these local modulations can reduce the entanglement's decay rate and may facilitate controlled oscillations of entanglement that result in entanglement partial resuscitation. In the case of separate systems, we show that controlling the asymmetry between the systems' decoherence rates may result in partial resuscitation in non-Markovian time scales. Furthermore, controlling the time-dependent cross-decoherence of systems coupled to the same bath may exhibit partial resuscitation on longer time scales, dictated by the local modulations.

PACS
03.65.Yz - Decoherence; open systems; quantum statistical methods.
03.67.Bg - Entanglement production and manipulation.
42.25.Kb - Coherence.

© EPLA 2008