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R. Werner, Quantum Inf. Comput. 4
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2008

Joint measurement of two unsharp observables of a qubit

Yu, Sixia, Liu, Naile, Li, Li et al.

Understand

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.