On the Notion of Coexistence in Quantum Mechanics

  title={On the Notion of Coexistence in Quantum Mechanics},
  author={Paul Busch and Jukka Kiukas and P Lahti},
The notion coexistence of quantum observables was introduced to describe the possibility of measuring two or more observables together. Here we survey the various different formalisations of this notion and their connections. We review examples illustrating the necessary degrees of unsharpness for two noncommuting observables to be jointly measurable (in one sense of the phrase). We demonstrate the possibility of measuring together (in another sense of the phrase) noncoexistent observables… CONTINUE READING

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