Joint measurement of two unsharp observables of a qubit

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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.
5 pages 3 figures

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/169179

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0805.1538
 http://arxiv.org/abs/0805.1538

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arXiv