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arXiv · 0707.2372

Importance of bath dynamics for decoherence in spin systems

Shengjun Yuan·Mikhail I. Katsnelson·Hans De Raedt
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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.

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Shengjun Yuan, Mikhail I. Katsnelson, Hans De Raedt. 2007-07-16. Importance of bath dynamics for decoherence in spin systems. https://arxiv.org/abs/0707.2372

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