Entanglement certification with randomized measurements is the most resource-intensive task among all two-qubit invariants because it requires the maximum number of measurement settings.
If, however,Ois not a product observable, we de- compose it in terms ofr≥2product observables, O= rP j=1 O(j) 1 ⊗...⊗ O (j) n ≡ rP j=1 O(j)
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Entanglement quantification with randomized measurements is maximally difficult
Entanglement certification with randomized measurements is the most resource-intensive task among all two-qubit invariants because it requires the maximum number of measurement settings.