A lower bound of concurrence for multipartite quantum systems

Xue-Na Zhu, Ming Li, and Shao-Ming Fei

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Submission date: 06. Feb. 2018
Pages: 8
published in: Quantum information processing, 17 (2018) 2, art-no. 30 
DOI number (of the published article): 10.1007/s11128-017-1801-x
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Abstract:
We present a lower bound of concurrence for four-partite systems in terms of the concurrence for M(2 ≤ M ≤ 3) part quantum systems and give an analytical lower bound for 2 ⊗ 2 ⊗ 2 ⊗ 2 mixed quantum sates. It is shown that these lower bounds are able to improve the existing bounds and detect entanglement better. Furthermore, our approach can be generalized to multipartite quantum systems.