Concurrence-Based Entanglement Measure for Werner States

Kai Chen, Sergio Albeverio, and Shao-Ming Fei

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Submission date: 13. Oct. 2006
Pages: 14
published in: Reports on mathematical physics, 58 (2007) 3, p. 449-458 
DOI number (of the published article): 10.1016/S0034-4877(07)00003-1
Bibtex
Keywords and phrases: Entanglement Measure, Werner states, Concurrence, Tangle
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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.