The optimality of a class of entanglement witnesses constructed from any permutation $$\pi $$ π for any $$n\otimes n$$ n ⊗ n bipartite systems is investigated. A necessary and sufficient condition is presented for such entanglement witnesses to be optimal, and thus, a class of optimal entanglement witnesses constructed by permutations is obtained.
Quantum Information Processing – Springer Journals
Published: May 5, 2015
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