Physics – Quantum Physics
Scientific paper
2006-11-28
Chinese Physics 2007/16(06)/1489-16
Physics
Quantum Physics
32 pages, Chinese Physics (accepted)
Scientific paper
10.1088/1009-1963/16/6/001
The dynamics of two coupled spins-1/2 coupled to a spin-bath is studied as an extended model of the Tessieri-Wilkie Hamiltonian \cite{TWmodel}. The pair of spins served as an open subsystem were prepared in one of the Bell states and the bath consisted of some spins-1/2 is in a thermal equilibrium state from the very beginning. It is found that with the increasing the 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 are recovered in some extent to the isolated subsystem. This suppression of the subsystem decoherence may be used to control the quantum devices in practical applications.
Jing Jun
Ma Hong-Ru
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