A case of spurious quantum entanglement originated by a mathematical property with a non physical parameter.
J.D. Bulnes, Fábio Aurélio Bonk · Dialnet (Universidad de la Rioja) · 2014
in which: e is a parameter with value in the interval > < 1 , 0 , 4 I is the identity matrix and 1 ρ is a density matrix. A generalization of the kind of the above matrix (as it was performed in [1]) consists of maintaining the form pseudo-pure and including a Hermitian matrix E 1 ρ that has (at least) a negative eigenvalue in the place of the density matrix 1 ρ ; then we write: E E I 1 4 4 ) 1 ( eρ e ρe + − = . (2)