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A Lower Bound on Concurrence |
| LIU Li-Guo1,2, TIAN Cheng-Lin1, CHEN Ping-Xing1, YUAN Nai-Chang2 |
| 1Department of Physics, National University of Defense Technology, Changsha 4100732Institute of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073 |
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| Cite this article: |
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LIU Li-Guo, TIAN Cheng-Lin, CHEN Ping-Xing et al 2009 Chin. Phys. Lett. 26 060306 |
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Abstract We derive an analytical lower bound on the concurrence for bipartite quantum systems with an improved computable cross norm or realignment criterion and an improved positive partial transpose criterion respectively. Furthermore we demonstrate that our bound is better than that obtained from the local uncertainty relations criterion with optimal local orthogonal observables which is known as one of the best estimations of concurrence.
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| Keywords:
03.65.-w
03.67.Mn
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Received: 06 October 2008
Published: 01 June 2009
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| PACS: |
03.65.-w
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(Quantum mechanics)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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