Maximum entanglement of quantum-dot systems with single excitation in the spin van der Waals model
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Time evolution of entanglement of N quantum dots is analyzed within the spin-1/2 van der Waals (or Lipkin-Meshkov-Glick) XY model. It is shown that, for a single dot initially excited and disentangled from the remaining unexcited dots, the maximum bipartite entanglement can be obtained in the systems of N=2,...,6 dots only.
2 pages, 3 figures
2 pages, 3 figures