Spin- and entanglement-dynamics in the central spin model with homogeneous couplings

Details Spin- and entanglement-dynamics in the central spin model with homogeneous couplings Spin- and entanglement-dynamics in the central spin model with homogeneous couplings

2006-10-31

arxiv.org/abs/cond-mat/0610856v3

J. Stat. Mech. (2007) P06018

Physics

Condensed Matter

Statistical Mechanics

8 pages, 2 figures, typos corrected, published version

Scientific paper

10.1088/1742-5468/2007/06/P06018

We calculate exactly the time-dependent reduced density matrix for the central spin in the central-spin model with homogeneous Heisenberg couplings. Therefrom, the dynamics and the entanglement entropy of the central spin are obtained. A rich variety of behaviors is found, depending on the initial state of the bath spins. For an initially unpolarized unentangled bath, the polarization of the central spin decays to zero in the thermodynamic limit, while its entanglement entropy becomes maximal. On the other hand, if the unpolarized environment is initially in an eigenstate of the total bath spin, the central spin and the entanglement entropy exhibit persistent monochromatic large-amplitude oscillations. This raises the question to what extent entanglement of the bath spins prevents decoherence of the central spin.

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