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Are quantum correlations symmetric ?

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arxiv quant-ph/0512224 v1 pith:ECY7A73O submitted 2005-12-23 quant-ph

Are quantum correlations symmetric ?

classification quant-ph
keywords entanglementmeasuresymmetricasymmetrycannotloccquantumstate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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To our knowledge, all known bipartite entanglement measures are symmetric under exchange of subsystems. We ask if an entanglement measure that is not symmetric can exist. A related question is if there is a state that cannot be swapped by means of LOCC. We show, that in general one cannot swap states by LOCC. This allows to construct nonsymmetric measure of entanglement, and a parameter that reports asymmetry of entanglement contents of quantum state. We propose asymptotic measure of asymmetry of entanglement, and show that states for which it is nonzero, contain necessarily bound entanglement.

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