EPJ Special Topics

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Eur. Phys. J. Special Topics 159, 71-77 (2008)
DOI: 10.1140/epjst/e2008-00694-x

Estimation of concurrence for multipartite mixed states

X.-H. Gao¹ and S.-M. Fei²

¹ Department of Mathematics, Capital Normal University, Beijing 100037, PR China
² Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig, Germany

Published online: 21 May 2008

Abstract
We investigate the lower bound of concurrence for multipartite quantum mixed states. Analytical lower bounds are derived for some multipartite systems, by establishing functional relations between concurrence and the generalized partial transpositions.