Deciding whether a quantum state has secret correlations is an NP-complete problem
Jae-Weon Lee, DoYong Kwon, Jaewan Kim
Abstract
From the NP-hardness of the quantum separability problem and the relation between bipartite entanglement and the secret key correlations, it is shown that the problem deciding whether a given quantum state has secret correlations in it or not is in NP-complete.
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