Separable balls around the maximally mixed state for a 3-qubit system
Abstract
Description
We obtain a new lower bound on the radius of the largest ball of separable unnormalized states around the identity matrix for a 3-qubit system. This also enables us to improve the corresponding lower bounds for multi-qubit systems. These bounds are approximately 5% better than the previously known ones. As a by-product, we compute the radius of the largest ball that fits into the triple projective tensor product of the unit ball in R^3.
9 pages, no figures; based on quant-ph/0503194
9 pages, no figures; based on quant-ph/0503194