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MiS Preprint

Lower Bound of Concurrence for Qubit Systems

Xue-Na Zhu and Shao-Ming Fei


We study the concurrence of four-qubit quantum states and provide analytical lower bounds of concurrence in terms of the monogamy inequality of concurrence for qubit systems. It is shown that these lower bounds are able to improve the existing bounds and detect entanglement better. The approach is generalized to arbitrary qubit systems.

03.67.-a, 02.20.Hj, 03.65.-w

Related publications

2014 Repository Open Access
Xue-Na Zhu and Shao-Ming Fei

Lower bound of concurrence for qubit systems

In: Quantum information processing, 13 (2014) 3, pp. 815-823