25,168 research outputs found
On Strong Monogamy Conjecture in Four-Qubit System
Monogamy is a defining feature of entanglement, having far reaching
applications. Recently, Regula \textit{et.al.} in Phys. Rev. Lett.
\textbf{113}, 110501(2014) have proposed a stronger version of monogamy
relation for concurrence. We have extended the strong monogamy inequality for
another entanglement measure, viz., negativity. In particular, we have
concentrated on four-qubit system and provided a detail study on the status of
strong monogamy on pure states. Further, we have analytically provided some
classes of states for which negativity and squared negativity satisfy strong
monogamy. Numerical evidences have also been shown in proper places. Our
analysis also provides cases where strong monogamy is violated.Comment: 8 pages, 8 figures, revtex, comments welcom
- …