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Optimal class-specific witnesses for three-qubit entanglement from Greenberger-Horne-Zeilinger symmetry

Eltschka, Christopher ; Siewert, Jens


Recently, a new type of symmetry for three-qubit quantum states was introduced, the so-called Greenberger-Horne-Zeilinger (GHZ) symmetry. It includes the operations which leave the three-qubit standard GHZ state unchanged. This symmetry is powerful as it yields families of mixed states that are, on the one hand, complex enough from the physics point of view and, on the other hand, simple enough ...


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