Optimal decompositions of barely separable states

@article{DiVincenzo1999OptimalDO,
  title={Optimal decompositions of barely separable states},
  author={David P. DiVincenzo and Barbara M. Terhal and Ashish V. Thapliyal},
  journal={Journal of Modern Optics},
  year={1999},
  volume={47},
  pages={377 - 385}
}
Abstract Two families of bipartite mixed quantum states are studied for which it is proved that the number of members in the optimal-decomposition ensemble—the ensemble realizing the entanglement of formation—is greater than the rank of the mixed state. We find examples for which the number of states in this optimal ensemble can be larger than the rank by an arbitrarily large factor. In one case the proof relies on the fact that the partial transpose of the mixed state has zero eigenvalues; in… Expand
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