Joint measurement of two unsharp observables of a qubit
Quantum Physics
2008-09-17 v2
Abstract
We present a single inequality as the necessary and sufficient condition for two unsharp observables of a two-level system to be jointly measurable in a single apparatus and construct explicitly the joint observables. A complementarity inequality arising from the condition of joint measurement, which generalizes Englert's duality inequality, is derived as the trade-off between the unsharpnesses of two jointly measurable observables.
Cite
@article{arxiv.0805.1538,
title = {Joint measurement of two unsharp observables of a qubit},
author = {Sixia Yu and Naile Liu and Li Li and C. H. Oh},
journal= {arXiv preprint arXiv:0805.1538},
year = {2008}
}
Comments
5 pages 3 figures