How entangled can two couples get?

Details How entangled can two couples get? How entangled can two couples get?

2000-05-02

arxiv.org/abs/quant-ph/0005013v2

Phys. Lett. A 273 (2000), 213-217

Physics

Quantum Physics

9 pages. Note added about the robustness of the entanglement in the four-qubit state described in the paper. Version to be pub

Scientific paper

10.1016/S0375-9601(00)00480-1

We describe a pure state of four qubits whose single-qubit density matrices
are all maximally mixed and whose average entanglement as a system of two pairs
of qubits appears to be maximal.

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