Eur. Phys. J. D 33, 129-132 (2005)
https://doi.org/10.1140/epjd/e2005-00023-y

Two-qubit entanglement in an antiferromagnetic environment

Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China

Corresponding author: ^a yxz@sjtu.edu.cn

Received: 30 September 2004
Revised: 19 December 2004
Published online: 8 February 2005

Abstract

Using the spin wave approximation, we study the entanglement of a two-spin system in an antiferromagnetic environment. It is shown analytically that the concurrence of the two-spin system displays a Gaussian decay and depends on the quantum correlations and the structure of the environment. The relation between the concurrence and the environmental temperature is given explicitly.