

Preprint 21/2013
Identification of three-qubit entanglement
Ming-Jing Zhao, Ting-Gui Zhang, Xianqing Li-Jost, and Shao-Ming Fei
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Submission date: 01. Feb. 2013
Pages: 7
published in: Physical review / A, 87 (2013) 1, art-no. 012316
DOI number (of the published article): 10.1103/PhysRevA.87.012316
Bibtex
PACS-Numbers: 03.65.Ud, 03.67.Mn
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Abstract:
We present a way in identifying all kinds of entanglement for
three-qubit pure states in terms of the expectation values of Pauli operators. The necessary and sufficient conditions to classify the
fully separable, biseparable and genuine entangled states are
explicitly given. The approach can be generalized to multipartite
high dimensional case. For three-qubit mixed states, we propose two kinds of inequalities in terms of the expectation values of complementary observables. One inequality has advantages in entanglement detection of quantum state with positive partial transpositions and the other is able to detect genuine entanglement. The results give an effective way in
experimental entanglement identification.