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Lower Bound of Concurrence Based on Generalized Positive Maps |
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| Authors: | QIN Hui-Hui FEI Shao-Ming |
| Affiliation: | 1. Department of Mathematics, School of Science, South China University of Technology, Guangzhou 510640, China;2. School of Mathematical Sciences, Capital Normal University, Beijing 100048, China;3. Max-Planck-Institute for Mathematics in the Sciences, 04103 Leipzig, Germany |
| Abstract: | We study the concurrence of arbitrary dimensional bipartite quantum systems. By using a positive but not completely positive map, we present an analytical lower bound of concurrence. Detailed examples are used to show that our bound can detect entanglement better and can improve the well known existing lower bounds. |
| Keywords: | lower bound of concurrence positive maps |
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