Concurrence of arbitrary dimensional bipartite quantum states

Details Concurrence of arbitrary dimensional bipartite quantum states Concurrence of arbitrary dimensional bipartite quantum states

2005-06-16

arxiv.org/abs/quant-ph/0506136v2

Phys. Rev. Lett. 95, 040504 (2005)

Physics

Quantum Physics

4 pages, published version

Scientific paper

10.1103/PhysRevLett.95.040504

We derive an analytical lower bound for the concurrence of a bipartite quantum state in arbitrary dimension. A functional relation is established relating concurrence, the Peres-Horodecki criterion and the realignment criterion. We demonstrate that our bound is exact for some mixed quantum states. The significance of our method is illustrated by giving a quantitative evaluation of entanglement for many bound entangled states, some of which fail to be identified by the usual concurrence estimation method.

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