Concurrence, Tangle and Fully Entangled Fraction of Quantum Entanglement

Ming Li, Shao-Ming Fei, and Xianqing Li-Jost

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Submission date: 22. Jul. 2010
Pages: 16
published in: Chinese physics / B, 19 (2010) 9, art-no. 090315 
DOI number (of the published article): 10.1088/1674-1056/19/9/090315
Bibtex
with the following different title: Concurrence, tangle and fully entangled fraction
Keywords and phrases: Concurrence, entanglement, Teleportation
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Abstract:
We show that although we can not distill a singlet from many pairs of bound entangled states, the concurrence and tangle of two entangled quantum states are always strictly larger than that of one, even both entangled quantum states are bound entangled. We present a relation between the concurrence and the fidelity of optimal teleportation. We also give new upper and lower bounds for concurrence and tangle.