On the volume of the set of mixed entangled states II
arXiv:quant-ph/9902050 · doi:10.1103/PhysRevA.60.3496
Abstract
The problem of of how many entangled or, respectively, separable states there are in the set of all quantum states is investigated. We study to what extent the choice of a measure in the space of density matrices describing N--dimensional quantum systems affects the results obtained. We demonstrate that the link between the purity of the mixed states and the probability of entanglement is not sensitive to the measure chosen. Since the criterion of partial transposition is not sufficient to distinguish all separable states for N > 6, we develop an efficient algorithm to calculate numerically the entanglement of formation of a given mixed quantum state, which allows us to compute the volume of separable states for N=8 and to estimate the volume of the bound entangled states in this case.
14 pages in Latex, Revtex + epsf; 7 figures in .ps included (one new figure in the revised version, several minor changes)
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