Foundations of Physics

, Volume 39, Issue 7, pp 712-730

First online:

On the Sharpness and Bias of Quantum Effects

  • Paul BuschAffiliated withDepartment of Mathematics, University of York Email author 

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The question of quantifying the sharpness (or unsharpness) of a quantum mechanical effect is investigated. Apart from sharpness, another property, bias, is found to be relevant for the joint measurability or coexistence of two effects. Measures of bias will be defined and examples given.


Quantum measurement Joint observable Coexistence Effect Unsharp observable Bias