Abstract
With an aim to detect the genuine entanglement of a mixed state at the nearby pure state, we reflect a practicable approach concerning the construction of witness and express expectations to detect separable, bipartite states, and multiqubit entangled states. We introduce the related concept of the density matrix, multiqubit state, entangled state entanglement witness, etc. In addition, we give unambiguous definitions of separable states, entangled states, and genuinely entangled states. Therefore, we are able to detect the genuine entanglement of a mixed state at the nearby pure state employing the witness that is constructed for the multiqubit states.
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