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Simplifying monotonicity conditions for entanglement measures

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arxiv quant-ph/0412210 v1 pith:WZ4NM4MR submitted 2004-12-28 quant-ph

Simplifying monotonicity conditions for entanglement measures

classification quant-ph
keywords conditionslocalunderfunctioninvariancemonotonicityaddingancilla
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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: 1)invariance under local unitaries, 2) invariance under adding local ancilla in arbitrary state 3) on mixtures of states possessing local orthogonal flags the function is equal to its average. The result holds for multipartite systems. It is intriguing that the obtained conditions are equalities. The only inequality is hidden in the condition of convexity.

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