Possibility of generalized monogamy relations for multipartite entanglement beyond three qubits

Details Possibility of generalized monogamy relations for multipartite entanglement beyond three qubits Possibility of generalized monogamy relations for multipartite entanglement beyond three qubits

2009-04-06

arxiv.org/abs/0904.1034v1

Physics

Quantum Physics

Scientific paper

We discuss the possibility to interpret the residual entanglement for more than three qubits in terms of distributed multipartite entanglement, or, in other words, possible extensions of the Coffman-Kundu-Wootters monogamy equality to higher qubit numbers. Existing knowledge on entanglement in multipartite systems puts narrow constraints on the form of such extensions. We study various examples for families of pure four-qubit states for which the characterization of three-qubit and four-qubit entanglement in terms of polynomial invariants is known. These examples indicate that, although families with such extensions do exist, a generalized monogamy equality cannot be found along those lines.

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