Barycentric measure of quantum entanglement
| Autor: | Ganczarek, Wojciech, Kuś, Marek, Życzkowski, Karol |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 85, 032314 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.85.032314 |
| Popis: | 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. Comment: 11 pages, 13 figures |
| Databáze: | arXiv |
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