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On the distribution of entanglement changes produced by unitary operations

J. Batle, A. R. Plastino, M. Casas, A. Plastino

quant-pharXiv:quant-ph/0603057

Abstract

We consider the change of entanglement of formation ΔE produced by a unitary transformation acting on a general (pure or mixed) state ρ describing a system of two qubits. We study numerically the probabilities of obtaining different values of ΔE, assuming that the initial state is randomly distributed in the space of all states according to the product measure introduced by Zyczkowski et al. [Phys. Rev. A 58 (1998) 883].

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