Entanglement for a two-parameter class of states in $2\otimes n$ quantum system

Details Entanglement for a two-parameter class of states in $2\otimes n$ quantum system Entanglement for a two-parameter class of states in $2\otimes n$ quantum system

2003-09-09

arxiv.org/abs/quant-ph/0309073v1

J. Phys. A 36, 11503 (2003)

Physics

Quantum Physics

10 pages, including 4 figures, accepted for publication in J. Phys. A

Scientific paper

10.1088/0305-4470/36/45/010

We exhibit a two-parameter class of states $\rho_{(\alpha,\gamma)}$, in $2\otimes n$ quantum system for $n\ge 3$, which can be obtained from an arbitrary state by means of local quantum operations and classical communication, and which are invariant under all bilateral %unitary operations %of the form $U\otimes U$ on $2\otimes n$ quantum system. We calculate the negativity of $\rho_{(\alpha,\gamma)}$, and a lower bound and a tight upper bound on its entanglement of formation. It follows from this calculation that the entanglement of formation of $\rho_{(\alpha,\gamma)}$ cannot exceed its negativity.

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