On the sharpness and bias of quantum effects

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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.
Original languageEnglish
Pages (from-to)712-730
Number of pages18
JournalFoundations of Physics
Issue number7
Publication statusPublished - Jul 2009

Bibliographical note

© Springer Science+Business Media, LLC 2009. This is an author produced version of a paper published in 'Foundations of Physics'. Uploaded in accordance with the publisher's self-archiving policy.


  • quantum measurement
  • joint observable
  • coexistence
  • effect
  • unsharp observable
  • bias

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