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Simplifying Monotonicity Conditions for Entanglement Measures

Simplifying Monotonicity Conditions for Entanglement Measures

We show that for a convex function the following, rather modest conditions, are equivalent to monotonicity under local operations and classical communication. The conditions are: (i) invariance under local unitaries, (ii) invariance under adding local ancilla in arbitrary state (iii) on mixtures of states possessing local orthogonal flags the function …