Linear-cluster states yield four- and five-qubit witnesses with quantum values 4+2√2 and 6+4√2 against hidden-influence bounds 6 and 10.
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Cluster-State Witnesses of Finite-Speed Hidden Influences
Linear-cluster states yield four- and five-qubit witnesses with quantum values 4+2√2 and 6+4√2 against hidden-influence bounds 6 and 10.