Issue
EPL
Volume 82, Number 4, May 2008
Article Number 40002
Number of page(s) 4
Section General
DOI http://dx.doi.org/10.1209/0295-5075/82/40002
Published online 25 April 2008
EPL, 82 (2008) 40002
DOI: 10.1209/0295-5075/82/40002

Hastening, delaying, or averting sudden death of quantum entanglement

A. R. P. Rau1, Mazhar Ali2 and G. Alber2

1  Department of Physics and Astronomy, Louisiana State University - Baton Rouge, LA 70803, USA
2  Institut für Angewandte Physik, Technische Universität Darmstadt - D-64289, Germany, EU

arau@phys.lsu.edu
gernot.alber@physik.tu-darmstadt.de

received 22 January 2008; accepted in final form 26 March 2008; published May 2008
published online 25 April 2008

Abstract
The finite time end of entanglement between two decohering qubits can be modified by local, unitary actions performed during the decoherence process. Depending on the time when such action is taken, the end can be speeded up or slowed down, or even averted all together. This phenomenon offers practical applications for the stabilization of entangled quantum states. Details concerning hastening or delaying the finite-time end of entanglement are presented for two qubits which decay spontaneously into statistically independent reservoirs.

PACS
03.67.-a - Quantum information.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).

© EPLA 2008