Binegativity and geometry of entangled states in two qubits

Details Binegativity and geometry of entangled states in two qubits Binegativity and geometry of entangled states in two qubits

2003-08-10

arxiv.org/abs/quant-ph/0308056v3

Phys. Rev. A 69, 020301(R) (2004)

Physics

Quantum Physics

5 pages, 3 figures. I made the proof more transparent

Scientific paper

10.1103/PhysRevA.69.020301

We prove that the binegativity is always positive for any two-qubit state. As a result, as suggested by the previous works, the asymptotic relative entropy of entanglement in two qubits does not exceed the Rains bound, and the PPT-entanglement cost for any two-qubit state is determined to be the logarithmic negativity of the state. Further, the proof reveals some geometrical characteristics of the entangled states, and shows that the partial transposition can give another separable approximation of the entangled state in two qubits.

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