Abstract The dynamics of two coupled spins-1/2 coupled to a spin-bath is studied as an extended model of the Tessieri--Wilkie Hamiltonian. The pair of spins served as an open subsystem is prepared in one of the Bell states and the bath consisting of some spins-1/2 is in a thermal equilibrium state from the very beginning. It is found that with increasing coupling strength of the bath spins, the bath forms a resonant antiferromagnetic order. The polarization correlation between the two spins of the subsystem and the concurrence of it are recovered to some extent in the isolated subsystem. This suppression of the subsystem decoherence may be used to control the quantum devices in practical applications.
Received: 24 August 2006
Revised: 07 January 2007
Accepted manuscript online:
PACS:
03.65.Yz
(Decoherence; open systems; quantum statistical methods)
Fund: Project supported
by the National Natural Science Foundation of China (Grant Nos
10334020 and 90103035), and in part by the Chinese Minister of
Education Program for Changjiang Scholars and Innovative Research
Team in University.
Cite this article:
Jing Jun(景俊) and Ma Hong-Ru(马红孺) Suppression of decoherence by bath ordering 2007 Chinese Physics 16 1489
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