Concurrence, tangle and fully entangled fraction |
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| Authors: | Li Ming Fei Shao-Ming Li-Jost Xianqing |
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| Affiliation: | College of Mathematics and Computational Science, China University of Petroleum, Dongying 257061, China; Department of Mathematics, Capital Normal University, Beijing 100037, China; Max-Planck-Institute for Mathematics in the Sciences, Leipzig 04103, Germany |
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| Abstract: | We show that although we cannot distil a singlet from many pairs of bound entangled states, the concurrence and the tangle of two entangled quantum states are always strictly larger than those of one of them, 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. |
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| Keywords: | concurrence entanglement teleportation |
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