Topological entanglement entropy.

  title={Topological entanglement entropy.},
  author={Alexei Y. Kitaev and John Preskill},
  journal={Physical review letters},
  volume={96 11},
We formulate a universal characterization of the many-particle quantum entanglement in the ground state of a topologically ordered two-dimensional medium with a mass gap. We consider a disk in the plane, with a smooth boundary of length L, large compared to the correlation length. In the ground state, by tracing out all degrees of freedom in the exterior of the disk, we obtain a marginal density operator rho for the degrees of freedom in the interior. The von Neumann entropy of rho, a measure… Expand

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