Degree of entanglement for two qubits
Quantum Physics
2009-11-07 v2
Abstract
We demonstrate that any pure bipartite state of two qubits may be decomposed into a superposition of a maximally entangled state and an orthogonal factorizable one. Although there are many such decompositions, the weights of the two superposed states are, remarkably, unique. We propose a measure of entanglement based on this decomposition. We also demonstrate that this measure is connected to three measures of entanglement previously set forth: maximal violation of Bell's inequality, concurrence, and two-particle visibility.
Cite
@article{arxiv.quant-ph/0109081,
title = {Degree of entanglement for two qubits},
author = {Ayman F. Abouraddy and Bahaa E. A. Saleh and Alexander V. Sergienko and Malvin C. Teich},
journal= {arXiv preprint arXiv:quant-ph/0109081},
year = {2009}
}
Comments
12 pages, no figures