Positive maps and limits for a class of protocols of entanglement distillation

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  • 7 August 1997
Abstract
Using positive maps, we find a separability criterion which allows to determine all the inseparable states of two N-level systems which can be distilled to a singlet form by any protocols consisting of noncollective one-side filtering and twirling. It is done via generalized distillation protocol using generalized XOR and twirling operations. The latter leads to the construction of family of states describing generalized depolarising channel.

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