Analytic Expressions for Geometric Measure of Three Qubit States

Details Analytic Expressions for Geometric Measure of Three Qubit States Analytic Expressions for Geometric Measure of Three Qubit States

2007-10-02

arxiv.org/abs/0710.0571v3

Phys. Rev. A 77, 022325 (2008)

Physics

Quantum Physics

6 pages, no figure, PRA version

Scientific paper

10.1103/PhysRevA.77.022325

A new method is developed to derive an algebraic equations for the geometric measure of entanglement of three qubit pure states. The equations are derived explicitly and solved in cases of most interest. These equations allow oneself to derive the analytic expressions of the geometric entanglement measure in the wide range of the three qubit systems, including the general class of W-states and states which are symmetric under permutation of two qubits. The nearest separable states are not necessarily unique and highly entangled states are surrounded by the one-parametric set of equally distant separable states. A possibility for the physical applications of the various three qubit states to quantum teleportation and superdense coding is suggested from the aspect of the entanglement.

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