Joint measurements of spin, operational locality, and uncertainty

E. Andersson, S.M. Barnett, A. Aspect

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Joint, or simultaneous, measurements of noncommuting observables are possible within quantum mechanics, if one accepts an increase in the variances of the jointly measured observables. In this paper, we discuss joint measurements of a spin-1/2 particle along any two directions. Starting from an operational locality principle, it is shown how to obtain a bound on how sharp the joint measurement can be. We give a direct interpretation of this bound in terms of an uncertainty relation.
Original languageEnglish
Pages (from-to)042104-1-042104-8
JournalPhysical Review A
Issue number4
Publication statusPublished - 13 Oct 2005


  • quantum physics
  • quantum mechanics
  • measured observables
  • photonics
  • optics

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