A lower bound of concurrence for multipartite quantum states

Abstract

We study the concurrence of arbitrary multipartite mixed quantum states. An explicit lower bound of the concurrence is derived, which detects quantum entanglement of some states better than some separability criteria, and gives sufficient conditions for distilling GHZ states from tripartite states. An interesting relations between the lower bound of the concurrence for bipartite states and for tripartite states has been presented.

8 pages,no figure

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• Evaluation of convex roof entanglement measures
• Estimating entanglement monotones with a generalization of the Wootters formula
• Entanglement Sudden Death in Three Qubit X-States
• Entanglement dynamics of three-qubit states in noisy channels
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• Non-Markovian quantum interconnect formed by a surface plasmon polariton waveguide
• Long range entanglement in quantum dot systems under the Fermi-Hubbard approach
• The lower bound to the concurrence for four-qubit W state under noisy channels
• Equation of motion for multiqubit entanglement in multiple independent noisy channels
• Projection based lower bounds of concurrence for multipartite quantum systems
• A note on lower bounds of concurrence for arbitrary dimensional bipartite quantum states
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• Symmetries of Multipartite Entanglement Evolution in Many-Sided Local Channels