Bounds of concurrence and their relation with fidelity and frontier states

Details Bounds of concurrence and their relation with fidelity and frontier states Bounds of concurrence and their relation with fidelity and frontier states

2008-08-15

arxiv.org/abs/0808.2077v3

Physics Letters A 373 (2009) 1616-1620

Physics

Quantum Physics

Scientific paper

10.1016/j.physleta.2009.03.009

The bounds of concurrence in [F. Mintert and A. Buchleitner, Phys. Rev. Lett. 98 (2007) 140505] and [C. Zhang \textit{et. al.}, Phys. Rev. A 78 (2008) 042308] are proved by using two properties of the fidelity. In two-qubit systems, for a given value of concurrence, the states achieving the maximal upper bound, the minimal lower bound or the maximal difference upper-lower bound are determined analytically.

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