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Concurrence-based entanglement measure for Werner States

Kai Chen, Sergio Albeverio, Shao-Ming Fei

quant-pharXiv:quant-ph/0702017

Abstract

We give explicit expressions for entanglement measures of Werner states in arbitrary dimensions in terms of concurrence and tangle. We show that an optimal ensemble decomposition for a joint density matrix of a Werner state can achieve the minimum average concurrence and tangle simultaneously. Furthermore, the same decomposition also attains entanglement of formation for Werner states.

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