Greenberger-Horne-Zeilinger argument of nonlocality without inequalities for mixed states
Greenberger-Horne-Zeilinger argument of nonlocality without inequalities for mixed states
We generalize the Greenberger-Horne-Zeilinger nonlocality without inequalities argument to cover the case of arbitrary mixed statistical operators associated to three-qubits quantum systems. More precisely, we determine the radius of a ball (in the trace distance topology) surrounding the pure GHZ state and containing arbitrary mixed statistical operators which cannot be …