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The quantification and classification of quantum entanglement is a veryimportant and still open question of quantum information theory. In this paper,we describe an entanglement measure for multipartite pure states (the minimumof Shannon's entropy of orthogonal measurements). This measure is additive,monotone under LOCC, and coincides with the reduced von Neumann entropy onbipartite states. A method for numerical calculation of this measure by geneticalgorithms is also presented. Moreover, the minimization of entropy techniqueis extended to fermionic states.

Entanglement measure for multipartite pure states and its numerical calculation