Lower Bound of Concurrence for Qubit Systems

Abstract

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.

10 pages, 1 figures

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Cited by in corpus (7)

• A lower bound of concurrence for multipartite quantum systems
• Efficient Entanglement Measure for Graph States
• Lower bounds of concurrence for $N$-qubit systems and the detection of $k$-nonseparability of multipartite quantum systems
• Lower bound on concurrence for arbitrary-dimensional tripartite quantum systems
• A brief review of Scott measure as a multipartite entanglement criterion
• Nonlinear entanglement witnesses for four qubits in mutually unbiased bases
• Lower bound of multipartite concurrence based on sub-multipartite quantum systems