Eur. Phys. J. D (2014) 68: 215
https://doi.org/10.1140/epjd/e2014-40824-1

Regular Article

Stationary entanglement and discord for dissipating qubits by local magnetic field

¹ Department of Physics, Majlesi branch, Islamic Azad University, Isfahan, Iran
² Department of Physics, University of Shahrood, 3619995161 Shahrood, Iran

^a e-mail: rasool_gh@yahoo.com
^b e-mail: m.rafiee178@gmail.com

Received: 23 December 2013
Received in final form: 31 January 2014
Published online: 7 August 2014

Abstract

We consider a system composed of n non-interacting qubits dissipating into a common environment. A local magnetic field interacting with a qubit is added to generate entanglement between the interacting qubit and each arbitrary qubit while the system is in the ground state. Our numerical calculations show that turning the local magnetic field off at the maximum entanglement (discord) time, leads to a stationary entanglement (discord) for different system size n.