Eur. Phys. J. D 61, 791-796 (2011)
https://doi.org/10.1140/epjd/e2010-10463-9

Entanglement dynamics of three-qubit coupled to an XY spin chain at finite temperature with three-site interaction

¹ Department of Applied Physics, Hebei University of Technology, Tianjin, 300401, P.R. China
² School of physics and optoelectronic technology, Dalian University of Technology, Dalian, 116024, P.R. China

Corresponding author: ^a guojinliang80@163.com

Received: 21 August 2010
Revised: 2 November 2010
Published online: 18 February 2011

Abstract

The entanglement dynamics of three-qubit states under an XY spin chain at finite temperature with three-site interaction is investigated. It is shown that the three-site interaction does not affect the behavior of quantum phase transition (QPT) induced by the external magnetic field and does not induce new critical regions in the XY model. In addition, concerned with the effect of the three-site interaction on the entanglement evolution, we find the three-site interaction can not only enhance but also suppress the decay of the entanglement between the three-qubit system, which depends on the initial states of the system and the parameters related with the environmental spin chain.