Monogamy inequality in terms of negativity for three-qubit states
- Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)
We propose an entanglement measure to quantify three-qubit entanglement in terms of negativity. A monogamy inequality analogous to the Coffman-Kundu-Wootters inequality is established. This consequently leads to a definition of residual entanglement, which is referred to as the three-{pi} in order to distinguish it from the three-tangle. The three-{pi} is proved to be a natural entanglement measure. By contrast to the three-tangle, it is shown that the three-{pi} always gives greater than zero values for pure states belonging to the W and Greenberger-Horne-Zeilinger classes, implying that three-way entanglement always exists for them; the three-tangle generally underestimates the three-way entanglement of a given system. This investigation will offer an alternative tool to understand genuine multipartite entanglement.
- OSTI ID:
- 20991093
- Journal Information:
- Physical Review. A, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevA.75.062308; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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