Barycentric measure of quantum entanglement

Details Barycentric measure of quantum entanglement Barycentric measure of quantum entanglement

2011-12-02

arxiv.org/abs/1112.0437v2

Phys. Rev. A 85, 032314 (2012)

Physics

Quantum Physics

11 pages, 13 figures

Scientific paper

10.1103/PhysRevA.85.032314

Majorana representation of quantum states by a constellation of n 'stars' (points on the sphere) can be used to describe any pure state of a simple system of dimension n+1 or a permutation symmetric pure state of a composite system consisting of n qubits. We analyze the variance of the distribution of the stars, which can serve as a measure of the degree of non-coherence for simple systems, or an entanglement measure for composed systems. Dynamics of the Majorana points induced by a unitary dynamics of the pure state is investigated.

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