Entanglement sudden death and its controlled partial resuscitation

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

Corresponding author: mail@gorengordon.com

Received: 1 May 2008
Accepted: 20 June 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.