Importance of bath dynamics for decoherence in spin systems
Other Condensed Matter
2007-07-18 v1 Quantum Physics
Abstract
We study the decoherence of two coupled spins that interact with a chaotic spin-bath environment. It is shown that connectivity of spins in the bath is of crucial importance for the decoherence of the central system. The previously found phenomenon of two-step decoherence (Phys. Rev. Lett. {\bf 90}, 210401 (2003)) turns out to be typical for the bath with a slow enough dynamics or no dynamics. For a generic random system with chaotic dynamics a conventional exponential relaxation to the pointer states takes place. Our results confirm a conjecture of Paz and Zurek (Phys. Rev. Lett. {\bf 82}, 5181 (1999)) that for weak enough interactions the pointer states are eigenstates of the central system.
Keywords
Cite
@article{arxiv.0707.2372,
title = {Importance of bath dynamics for decoherence in spin systems},
author = {Shengjun Yuan and Mikhail I. Katsnelson and Hans De Raedt},
journal= {arXiv preprint arXiv:0707.2372},
year = {2007}
}
Comments
submitted to Physical Review Letters